InfoMagic Standards 1994 January/InfoMagic Standards - January 1994.iso/ccitt/1988/troff/2_2_10.tro

Text File | 1991-12-12 | 128KB | 5,161 lines

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\s12PART\ V
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\fBSUPPLEMENTS\ TO\ THE\ SERIES\ E\ RECOMMENDATIONS\fR
.EF '%     \ \ \ ^''
.OF ''' \ \ \ ^    %'
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\fBRELATING\ TO\ THE\ OPERATION\ OF\ THE\fR
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\fBINTERNATIONAL\ SERVICE\fR
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.LP
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\fBMONTAGE:\fR PAGE 306 = PAGE BLANCHE
.sp 1P
.RT
.LP
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.sp 2P
.LP
\fBSupplement\ No.\ 1\fR
.RT
.sp 2P
.ce 1000
\fBLIST\ OF\ POSSIBLE\ \fR \fBSUPPLEMENTARY\ TELEPHONE\ SERVICES\fR
.EF '%    Fascicle\ II.2\ \(em\ Suppl.\ No.\ 1''
.OF '''Fascicle\ II.2\ \(em\ Suppl.\ No.\ 1    %'
.ce 0
.sp 1P
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\fBWHICH\ MAY\ BE\ OFFERED\ TO\ SUBSCRIBERS\fR
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.PP
The descriptions given here are considered provisional and
require further study.
.sp 1P
.RT
.PP
Numbers in parentheses following the designation of most services refer
to the
CEPT\ handbook
\ [1] where detailed operational requirements  are given.
.sp 2P
.LP
\fB1\fR \fBSupplementary services which might have implications for the\fR
\fBinternational service\fR
.sp 1P
.RT
.PP
\(sc\(sc 1.1 to 1.11 refer to services which might be standardized and
which do not require technical studies.
.RT
.sp 1P
.LP
1.1
    \fBabsent subscriber service\fR (4.1)
.sp 9p
.RT
.LP
    \fIF:\ service des abonnes absents\fR
.LP
    \fIS:\ servicio de abonado ausente\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    The possibility for a subscriber who cannot answer his
calls, because he is absent, to divert these calls to:
.LP
    \(em
    a
manual answering service
,
.LP
    \(em
    another subscriber's number or
.LP
    \(em
    an
announcement
.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     A subscriber who knows he will be absent from his telephone can instruct
the exchange to divert his incoming calls to:
.LP
    \(em
    a manual answering service,
.LP
    \(em
    another subscriber's number or
.LP
    \(em
    an announcement giving appropriate information.
.LP
    Some forms of the service are available to subscribers
without a preliminary agreement with the Administration, but
other forms require such an agreement. An indication that the
service is in operation should be given to the diverting
subscriber. Outgoing calls are available normally.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    CCITT should undertake studies on:
.LP
    \(em
    indications given to calling and called subscriber;
.LP
    \(em
    additional charges if any when diverting the call to a
distant number.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    Generally considered of medium interest. Terminating
equipment providing diversion to announcements in widespread
use in some countries.
\v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
    If diverting a call lengthens the
post\(hydialling
delay
experienced by a caller, it may be necessary to advise the caller
that his call is being diverted.
.LP
    If
diverting a call
would result in the caller
having to pay additional charges, a warning should be given to the caller
before the call is diverted.
.LP
     To minimize complaints from called subscribers and callers for wrongly
programmed call transfers, some check should be provided.
.LP
    Difficulties may arise if a subscriber receiving diverted
calls diverts them again to yet another number.
.bp
.LP
    Some subscribers may, instead of using an absent subscriber  service, use
answering machines
on their own premises. Some
Administrations may also decide to provide such facilities at
the exchange. The degree of sophistication provided may vary
considerably. Some may only give a fixed announcement common to
all customers using the service, others may allow messages to
be recorded. Which type is used and to what extent may vary from
one country to another according to the technological or social
situation.
.LP
    A large majority of customers will accept a reply by a
recorded announcement as a satisfactory alternative to an operator.
.LP
    Certain categories of subscribers (e.g.\ doctors) have
special requirements and prefer a service especially adapted to
their professional field. This may be a manual answering service
provided by the Administration, or by a private agency or
special arrangements for diversion to other numbers.
.LP
     Calls should only be diverted if the resulting standards of transmission
are adequate.
.LP
     When the service is activated the special dial tone may be given to the
controlling subscriber.
\v'3p'
.LP
    6)
    \fICharging principles\fR
.sp 1P
.LP
1.2
    \fBdo not disturb service\fR (5.1)
.sp 9p
.RT
.LP
    \fIF:\ service \*Qne pas d\*'eranger\*U\fR
.LP
    \fIS:\ servicio \*Qno molestar\*U\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    The possibility for a subscriber, who does not wish to
answer his telephone during a period of time, to divert
incoming calls.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     Do not disturb services are used by subscribers that do not wish to be
disturbed by incoming calls for a certain period of
time. They can request that incoming calls are diverted to an
operator, an answering machine in the exchange, or another
telephone number.
.LP
    The diversion can be switched on and off by an operator
(manual) or by the subscriber himself (automatic).
\v'3p'
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    A little market information is available but it is
considered to be of medium interest only. Nevertheless this is a
service which should be available to customers.
\v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
    It is in the interest of the Administration if calling
subscribers can leave messages and be informed:
.LP
    \(em
    of the reason for
call diversion
.LP
    \(em
    when the number can be reached again
.LP
    \(em
    where more information can be obtained.
.LP
     In this way incoming calls are answered and can be charged and ineffective
new attempts are avoided.
.LP
    Automatic deactivation
is desirable because no
indication is given to the called subscriber when incoming calls arrive.
.LP
     Administrations should provide an attractive form of do not disturb service
in order to avoid undesirable subscriber forms of
the service.
.LP
    The time during which a do not disturb service can be
activated should be limited.
.LP
    The automatic forms of the service are preferred.
.LP
    Outgoing calls should normally be possible.
.bp
.LP
    When the service is activated a
special dial tone
may be given for outgoing calls reminding the service holder of the special
condition of his line.
.LP
    If during a period when the facility is in operation, the
renter requires to know whether a message has been left, a special
code may be allocated for this purpose, or a
password
agreed with
the exchange may be used.
\v'3p'
.LP
    6)
    \fICharging principles\fR
.LP
    Charging principles should be in accordance with
Recommendation\ E.232.
.sp 1P
.LP
1.3
    \fBdiversion if number busy service\fR (6.3)
.sp 9p
.RT
.LP
    \fIF:\fR     \fIservice de transfert d'appel en cas de num\*'ero occup\*'e\fR
.LP
    \fIS:\fR     \fIservicio de transferencia de llamadas en caso de l\*'inea\fR
\fIocupada (transferencia por ocupaci\*'on)\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     The possibility for a subscriber who cannot receive calls, because his
number is busy, to have these calls diverted.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     A subscriber who does not wish incoming calls to his number to be unsuccessful
because he is busy speaking, can instruct the
exchange to immediately divert his incoming calls to either a
manual answering service, or another subscriber's number.
.LP
     Some forms of service are available to subscribers without prearrangement
with the Administration but other forms require
prearrangement. The other subscriber's number may be one number,
one number of a predetermined group or the first available
number in a sequence.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    CCITT should undertake studies on:
.LP
    \(em
    indication given to calling and called subscriber;
.LP
    \(em
    additional charges, if any, when diversion is to a
distant subscriber number.
\v'3p'
.LP
    4)
    \fIMarket data\fR \v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
    As services permit the completion of calls which would
otherwise have met busy conditions, increased revenue and a better
use of the available equipment may result.
.LP
    Services may be of value for a subscriber whose line or
lines are occasionally overloaded.
.LP
    In conventional switching systems it is not possible to
change the routing of a call in the switching network itself. It
is therefore necessary in those circumstances to divert it from the
diverting number. If limitations of transmission or charging
justify it, it may be necessary to refuse a diversion request to a
nominated number too far from the diverting exchange, and possibly
divert the call to the operator, or a recorded announcement.
.LP
     While a service is activated under subscriber's control it may be desirable
to return a warning indication to the diverting
termination.
.LP
     The number to which the incoming call is diverted need not belong to
the controlling subscriber.
.LP
    It may be necessary to advise the caller that his call is
being diverted if the post\(hydialling delay is lengthened by diversion.
.LP
    From the Administration's point of view use of a service
should not be allowed to perpetuate the unsatisfactory situation
where a subscriber has basically an inadequate incoming traffic
capacity.
.LP
     An appropriate indication should be returned to the caller if diversion
causes call charges greater than those that would have
applied if the call had been connected normally to the diverting
number.
\v'3p'
.LP
    6)
    \fICharging principles\fR .bp
.sp 1P
.LP
1.4
    \fBcustomer dialled operator assisted call\fR
.sp 9p
.RT
.LP
     \fIF:\fR \fIcommunication \*'etablie par l'abonn\*'e et assist\*'ee par\fR
\fIune op\*'eratrice\fR
.LP
    \fIS:\fR     \fIasistencia de operadora en comunicaciones\fR
\fIestablecidas por el abonado\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     With prior indication from a subscriber, an operator may be associated
with an automatically dialled call at the appropriate
stage to determine if the wanted person is available.
.LP
    The subscriber gives this indication as part of his
call set\(hyup procedure
.
.LP
    Implementation requires special equipment in the
long\(hydistance switching equipment and associated operator
positions.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
     Of low interest to customers. However, some Administrations are introducing
this service to increase operator productivity.
\v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR \v'3p'
.LP
    6)
    \fICharging principles\fR
.sp 1P
.LP
1.5
    \fBfreephone service\fR (7.5)
.sp 9p
.RT
.LP
    \fIF:\ service \*Qlibre\(hyappel\*U\fR
.LP
    \fIS:\ servicio de cobro revertido autom\*'atico\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     A subscriber can be allocated a special (freephone) number and the charge
for all calls to this number are paid by him
instead of by the callers.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     Subscribers who wish to pay for calls made to them can rent a special
freephone number. Calls made to this freephone number are
routed either to the subscriber's existing telephone number or on
to access lines specifically provided for the purpose of receiving
freephone calls.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    A freephone service can be provided across international
boundaries. CCITT recommendations regarding
billing and accounting
arrangements
may be required.
.LP
    Where an international freephone service is provided
i.e.\ where callers in one country can, by dialling a freephone
number in that country, gain access to a destination address
(service provider) in another country, international requirements
dictate that the called number must return an answer signal over
the international network to the freephone network of the
originating country.
.LP
    Many networks are protected by a \*Qtime\(hyout\*U where calls
are cleared if the answer signal is not received within a
pre\(hydetermined time. Depending on the arrangements by which
freephone service is provided the \*Qtime\(hyout\*U condition may need
to be removed from the part of the network between the caller
and the equipment offering the basic freephone facility in
his country. Basic freephone facilities can be provided by a freephone
exchange or network of exchanges to provide freephone number
translation and call routing, absorption of answer
billing/accounting information and network management statistics.
These facilities may be provided as an integral part of modern
digital networks.
.LP
     Freephone subscribers may place particular value on numbers which are
easy to remember. However, this may entail the
allocation of
hypothetical numbers
and the provision of
translation facilities
which may only prove economic when
sited at
nodal centres
.
\v'3p'
.bp
.LP
    4)
    \fIMarket data\fR
.LP
    Already exists in some countries and is becoming increasingly
popular.
\v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
    The
freephone number format
should be consistent
with the national number format of the country. The
freephone code
should be standard for the whole of the country (e.g.\ 800 in USA) and
where possible the same code should be used to provide national
and international freephone service.
.LP
    Network management arrangements should pay particular
attention to the need to prevent congestion in the network,
particularly in relation to applications involving response to
television quiz games or advertising campaigns, etc.
.LP
     Subscribers should be required to rent adequate access lines to meet
demand and minimize ineffective attempts. The freephone
service is liable to misuse and subscribers should be warned of
this liability and expect to bear any resulting call charges.
Regards should be made to the limitation of
payphones
in the
various systems.
\v'3p'
.LP
    6)
    \fICharging principles\fR
.LP
    6.1)
    National charging arrangements will depend on the
limitations of the arrangements used to provide the freephone
facilities. A single freephone centre may for example use path
of entry to determine the area from which the call originated and
charge accordingly.
.LP
    A freephone network may determine charging on the basis of
distance between the node at which the freephone call enters
the network and the node in which the freephone service is
connected. There are other alternatives.
.LP
    6.2)
    International charging arrangements require a method of
billing a service provider in another country and may also require
special accounting arrangements. There are 3 basic methods:
.LP
    a)
    The originating Administration provides the
destination Administration with the billing information
relating to freephone calls to service providers in the
destination country. The destination Administration would
then bill the service provider for call charges and account
the calls as if they were originated in the destination
country, (a procedure similar to the billing and accounting
.LP
of collect calls). A
special accounting rate
might be
required to reimburse the country of origin for the cost of
providing the freephone facility.
.LP
    b)
    The originating Administration would require the
service provider in the destination country to provide a
legal representative in the country of origin to which the
bill for call charges could be sent. The calls would be
accounted as ordinary outgoing international direct dialling (IDD) calls.
.LP
    c)
    The originating Administration would send the bill
directly to the service provider's address in the destination
country. The calls will be accounted as ordinary IDD calls.
.sp 1P
.LP
1.6
    \fBwide area telephone service\fR (7.6)
.sp 9p
.RT
.LP
    \fIF:\ service t\*'el\*'ephonique \*`a l'int\*'erieur d'une zone\fR
\fId\*'etermin\*'ee\fR
.LP
    \fIS:\ servicio telef\*'onico concertado en grandes zonas\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     For a flat rate charge, a subscriber may make an unlimited number of
calls within a prescribed area from a particular
telephone termination without the registration of call
charges.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
     Already exists and very popular in some countries. Appears to be of interest
also in other countries.
\v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR \v'3p'
.LP
    6)
    \fICharging principles\fR .bp
.sp 1P
.LP
1.7
    \fBautomatic transferred debiting of charges\fR (7.4)
.sp 9p
.RT
.LP
    \fIF:\ service de transfert automatique d'imputation de taxes\fR
.LP
    \fIS:\ servicio de transferencia autom\*'atica de las\fR
\fItasas imputadas\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     The automatic debiting to a subscriber's account of charges for calls
made from any telephone by persons nominated by that
subscriber and identified by the use of a
secret code
.
.LP
    This is similar to the existing
credit card
service  but does not involve an operator. It must be provided for throughout
a network.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    For international use there would have to be a study of
changes to operating and accounting procedures for
manual
credit card service
.
\v'3p'
.LP
    4)
    \fIMarket data\fR \v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR \v'3p'
.LP
    6)
    \fICharging principles\fR
.sp 1P
.LP
1.8
    \fBradio paging\fR (10.3)
.sp 9p
.RT
.LP
    \fIF:\ service radio\*'electrique d'appel unidirectionnel\fR
.LP
    \fIS:\ servicio m\*'ovil de aviso a personas (servicio de\fR
\fIradiob\*'usqueda)\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     The service provides the subscriber with the facility, by means of portable
equipment used in a given area, to receive an
alert by radio initiated by any telephone in a public network.
.LP
     The alert can be accompanied by a spoken message or visual coded display
either entered by the caller or generated within the
network.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     The mobile receiving equipment of a pocket sized nature has a unique
identity enabling it to be selectively called using a
common radio channel.
.LP
    An alert is initiated by a telephone on a public network
using a direct dialling number, with or without the requirement
to pass additional code digits on completion of the call through
.LP
the public network. Alerts can be made to one or more receivers
using a single number and restricted to predetermined geographical
zones in agreement with the renter.
.LP
     Additional alerts with distinctive tones can be incorporated in a single
receiver but individually activated by separate
calling numbers.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Under study in Study Group II
.LP
    CCIR standardized in 1982 a uni\(hydirectional signalling
system radio\(hypaging code No.\ 1 to use on the radio
channels for alerting receivers and providing text messages.
.LP
    CCITT should undertake studies on international access to
national radio\(hypaging services with particular attention to the
indication given to the caller.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    Already exists in some countries and is becoming
increasingly popular.
\v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
    The service should provide access to a
radiopager
using a normal telephone number and advise the caller that the pager is
being automatically called. In the case of a manual service the
caller should be advised that the pager will be called and the
appropriate voice message or coded display transmitted.
\v'3p'
.bp
.LP
    6)
    \fICharging principles\fR
.LP
    When used internationally the caller should be charged in
accordance with international direct dialling (IDD) service and standard
called subscriber answered conditions returned. The subscriber may be charged
for
having the service. This special charge may be fixed nationally.
.sp 1P
.LP
1.9
    \fBdirect dialling\(hyin\fR (12.1)
.sp 9p
.RT
.LP
    \fIF:\ s\*'election directe d'un poste suppl\*'ementaire\fR
.LP
    \fIS:\ marcaci\*'on directa de extensiones\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     Calls can be dialled from a telephone line connected to the public network
directly to
extensions in a\ PABX
.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
    Direct Dialling\(hyIn\ (DDI) can be realized when the last
digits in the directory number of a\ PABX correspond to the
number series of the
extensions
within the PABX. These last
digits are sent from the exchange to the\ PABX, which
automatically establishes a connection to the extension without
assistance of the PABX\ operator.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
     The dialled number must not exceed the number of digits of international
numbers (Recommendation\ E.163).
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    Already exists in many countries.
\v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
    A call to a number in the DDI numbering range shall be
routed to the appropriate extension at the
PABX
.
.LP
    Trunk offering may be required via the DDI route from an
operator of the public telephone network to a busy extension
line, irrespective of whether the extension line is busy with a
call in the PABX or with an external call to or from the public
telephone network. The call from the operator of the public
telephone network is then to be routed to an appropriate PABX
operator or extension.
.LP
     If a call is made by sending incomplete address information, the connection
will be released by time supervision within the
public exchange. A corresponding time supervision within the PABX
may also be convenient.
.LP
    Calls to numbers outside a DDI numbering plan within the
public exchange and calls to unassigned numbers within an exchange
DDI numbering range may immediately be re\(hyrouted according to normal
public exchange interception rules.
.LP
     Failures in the PABX causing inability to receive incoming calls should
be signalled from the PABX to the public exchange by suitable
means. The public exchange should return to callers the same indication as
given on a call to a faulty subscribers line.
\v'3p'
.LP
    6)
    \fICharging principles\fR
.PP
\fINote\fR \ \(em\ Numbers 1.10 to 1.20 (below) refer to services
which might be standardized but require further studies in CCITT Study
Groups before being handled in Study Group\ II.
.sp 1P
.LP
1.10
    \fBincoming call barring\fR (3.2)
.sp 9p
.RT
.LP
    \fIF:\ service de limitation des appels d'arriv\*'ee\fR
.LP
    \fIS:\ servicio de prohibici\*'on de llamadas entrantes\fR \v'3p'
.bp
.LP
    1)
    \fIDefinition\fR
.LP
    The ability of the Administration or the subscriber to
prevent all or certain incoming calls to a telephone line.
.LP
    No variants identified so far.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    This service can cause multiple repeat attempts and/or
unnecessary use of operator services.
.LP
    CCITT should undertake studies on:
.LP
    \(em
    indications given to the calling subscriber;
.LP
    \(em
     interworking between this service and the absent subscriber service and
do not disturb service;
.LP
    \(em
     interexchange signalling if only calls from certain numbers should be
barred.
\v'3p'
.LP
    4)
    \fIMarket data\fR \v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR \v'3p'
.LP
    6)
    \fICharging principles\fR
.sp 1P
.LP
1.11
    \fBregistration of incoming calls\fR (4.2)
.sp 9p
.RT
.LP
    \fIF:\ service d'enregistrement de communications d'arriv\*'ee\fR
.LP
    \fIS:\ servicio de registro de llamadas entrantes\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    The registration of details of all incoming calls to a
particular telephone line (e.g.\ caller's number, time ringing
commences, time of answer or time of abandonment, time of
release, but excluding the recording of speech).
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
     CCITT should undertake studies on interexchange signalling allowing sending
of different kinds of information.
\v'3p'
.LP
    4)
    \fIMarket data\fR \v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
    Subject to
national law and regulations
concerning
secrecy in telecommunications
the service could be provided when
required by connection of a device in the exchange to the subscriber's line
or by program instruction.
.LP
    This service could be useful to subscribers
(e.g.\
emergency services
) who may require detailed information of
incoming calls.
.LP
    Provision of the service could possibly act as a deterrent   to
malicious or nuisance callers
.
\v'3p'
.LP
    6)
    \fICharging principles\fR
.sp 1P
.LP
1.12
    \fBcompletion of calls to busy subscribers service\fR (6.1)
.sp 9p
.RT
.LP
    \fIF:\ service d'aboutissement d'appels adress\*'es \*`a des\fR
\fIabonn\*'es occup\*'es\fR
.LP
    \fIS:\ servicio de compleci\*'on de llamadas a abonado\fR
\fIocupado\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     The possibility for a subscriber who reaches a busy number to have the
call completed when the line becomes free without
generating a second call or waiting on the line.
\v'3p'
.bp
.LP
    2)
    \fIDescription\fR
.LP
    The subscriber who has found the called party busy can
activate the service during or after the call and wait for
establishment of the connection.
.LP
     When the service is activated, the line of the called party is tested.
When this line becomes free the calling party is rung
and when he answers the called party is rung. The time during
which the line of the called party is tested is limited. If the
calling party is found busy the service is deactivated.
.LP
    The service may be manual, semiautomatic or
automatic.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Applications in PBXs and local public exchanges
are suitable but, for long\(hydistance and international use,
if the service is controlled only from the originating
exchange, it may cause difficulties, such as:
.LP
    \(em
    long holding times;
.LP
    \(em
    multiple automatic reattempts.
.LP
    CCITT should undertake studies on
interexchange
signalling
to overcome the disadvantages mentioned.
\v'3p'
.LP
    4)
    \fIMarket data\fR \v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
    According to the manner of realization of the services,
consideration should be given to:
.LP
    \(em
    the length of the time during which the system attempts to set up a call,
.LP
    \(em
    the frequency of the
attempts to complete a
call
in order to avoid congesting the network unnecessarily,
.LP
    \(em
    the recall sequence to ensure that the calling
subscriber has answered the recall before the called subscriber is
rung.
.LP
    Special measures may be necessary to ensure that the
operation of the service does not interfere with normal outgoing
and incoming service on both lines.
.LP
    Special consideration should be given to the requirements
when one or both subscribers are involved in diversion
arrangements.
.LP
    Special consideration should be given to the provision of
the services to special categories of subscriber lines,
e.g.\ payphones, PBX lines with DDI, etc.
.LP
    It appears more convenient to adopt a realization of the
service based on a continuous check of the called subscriber's
state in order to set up the connection as soon as possible
(called party free). This realization is only feasible for
subscribers belonging to the same exchange or different exchanges
of an SPC type and connected by advanced signalling systems. This
condition is not, at present, the general case.
.LP
     Though provision of the service is likely to be advantageous both from
the Administration and the subscriber's point of view,
the numerous operational and technical problems associated with the
automatic services will make them very difficult to provide in the
near future.
.LP
     When the service is activated the line of the called party is continuously
tested. When this line becomes free the calling
party is rung and when he answers the called party is rung.
.LP
     It may be necessary to advise the calling party which call completion
is being offered (if, for example, the service has been
activated on more than one call).
.LP
     The number of call completions activated at the same time to the line
of a called busy party may be limited, e.g.\ to one.
\v'3p'
.LP
    6)
    \fICharging principles\fR
.sp 1P
.LP
1.13
    \fBautomatic transferred charge call\fR (7.9)
.sp 9p
.RT
.LP
    \fIF:\ service d'appel avec transfert automatique de taxe\fR
.LP
    \fIS:\ servicio de transferencia autom\*'atica de la tasa de la\fR
\fIcomunicaci\*'on\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     With prior indication and mutual agreement between the two parties, the
automatic debiting to a called subscriber's account
of relevant charges for a call made to his telephone number.
.LP
    No variants have been identified so far.
\v'3p'
.bp
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    CCITT should undertake studies on:
.LP
    \(em
    how the service is established;
.LP
    \(em
    agreement procedures between the calling and the called
party (additional interexchange signalling may be
required).
\v'3p'
.LP
    4)
    \fIMarket data\fR \v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR \v'3p'
.LP
    6)
    \fICharging principles\fR
.sp 1P
.LP
1.14
    \fBremote call forwarding\fR (7.11)
.sp 9p
.RT
.LP
    \fIF:\ service de r\*'eacheminement des appels\fR
.LP
    \fIS:\ servicio de teletransferencia de llamadas\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    The possibility for a subscriber to obtain a telephone
number in another area and have all calls to that number
automatically forwarded at his cost to a telephone number in his
premises.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     A subscriber who wants to receive calls at his premises at low cost for
callers in a certain (distant) area can be allocated
a telephone number in that area. All calls received by the
.LP
allocated number are automatically forwarded through the public
switched network to a telephone number at the subscriber's
premises. The allocated number can be a telephone number in
another country and the service will only be available on
pre\(hyarrangement with the Administration concerned.
\v'3p'
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR \v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
     The provision of the service requires an arrangement between the subscriber
and the Administration concerned.
.LP
    Forwarded calls are treated as normal incoming calls. The
calling subscriber may be informed by a recorded announcement that
his call will be forwarded without extra cost.
.LP
     In the case of international use, any promotional activities aimed at
customers abroad should be coordinated among
Administrations concerned to avoid problems.
.LP
     Fowarding should be possible to any telephone number except payphones
subject to compatibility limitation. Due regard must be
given to transmission limitations. It may not be suitable for data
transmission.
.LP
    Sufficient remote call forwarding (RCF) features and
facilities are necessary so as not to interfere with or impair any
services offered by the telephone company. Call forwarding should
not be offered again at the terminating telephone.
.LP
    The allocated telephone number may appear in its local
directory listing associated with the name and address of the
terminating location.
\v'3p'
.LP
    6)
    \fICharging principles\fR
.LP
     The caller is charged for the call to the allocated number only; the
charge related to the forwarded part of the call
is applied to the subscriber having the service.
.LP
    \(em
    As the service is only available on pre\(hyarrangement
with the Administration, a service provision charge and a
recurring rental charge may be applied.
.LP
    \(em
    The charge may be related to the number of lines
provided with the service.
.bp
.sp 1P
.LP
1.15
    \fBthree party services\fR (11.1)
.sp 9p
.RT
.LP
    \fIF:\ service comportant un troisi\*`eme correspondant\fR
.LP
    \fIS:\ servicio tripartito\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     The possibility for a busy subscriber to hold the existing call and make
a call to a third party. The following
arrangements may then be possible: the ability to switch between
the two calls, the introduction of a common speech path between
the three parties and the connection of the other
two parties.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     These services will permit a subscriber to place an existing call into
a suspended state and make a call to a third party.
When the third party answers, the subscriber may then make use
of the following options, as available, in any appropriate
order:
.LP
    \(em
     switch from one call to the other as required, secrecy being provided
between the two calls;
.LP
    \(em
    introduce a common (three\(hyway) speech path;
.LP
    \(em
    connect the other two parties together.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    CCITT should undertake study on:
.LP
    \(em
    transmission limitations;
.LP
    \(em
    charging and accounting
when the other two parties
enter into communication.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    Widely used in some countries by business subscribers.
\v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
    With this service the subscriber may be involved in
two simultaneous outgoing calls and it will be necessary to provide
the ability to register charges accurately under these conditions.
.LP
    Difficulties may be experienced in recording charges for
this service on a meter situated at the subscriber's premises.
.LP
    If the other parties to a three party service call also have
this service available it is possible for subscribers to
establish a complex chain of interconnections. It may be
necessary to prevent or limit such interconnections.
.LP
    The
hold\(hyfor\(hyenquiry mode
in its simple form would permit a busy subscriber to make an enquiry call,
then release it and return
to the original call. However, having the ability to retain both
calls, and switch from one to the other as required, will increase
considerably the usefulness of this service. Another feature which
might prove useful would enable the user to retain the
enquiry call
but release the original call, i.e.\ to specify which of the two calls
should be released.
.LP
    It is desirable that the subscribers should be able to
revert from
three way conversation
to the normal \*Qsingle call\*U
state and subsequently use the three party service again.
.LP
    All three party services require the register recall
feature.
.LP
    \fIHold for enquiry\fR
.LP
    An enquiry call may be made to any subscriber's number,
provided such a call is not inhibited by another service.
.LP
     If Subscriber A should clear whilst either the original call or the enquiry
call is in the suspended call path state, calling
conditions shall be applied to Subscriber\ A's terminal. On answer
the call shall proceed as if Subscriber A had released the other
.LP
call and switched to the held call. If Subscriber A does not answer
within a specified period the held subscriber shall be advised
that Subscriber A has cleared.
.bp
.LP
    \fIThree\(hyway conversation\fR
.LP
    When Subscriber\ A is connected by a speech path to
Subscriber\ B or C, the other connection being held, it shall be
possible for Subscriber\ A to establish a 3\(hyway conversation and
subsequently revert to the
enquiry mode
. The options in hold for
enquiry shall then be available.
.LP
    If Subscriber A should clear during a 3\(hyway conversation,
then the call paths shall be released. If Subscriber\ B or C should
clear, the connection between A and the other subscriber should
revert to that appropriate for a normal call.
.LP
    \fITransfer of an established call\fR
.LP
     When the hold\(hyfor\(hyenquiry option only is being employed, it shall
be possible for Subscriber\ A to signal that the transfer of the
held call to the subscriber to which he is connected by a call path
is required.
.LP
    Following the procedure described, the elected subscriber
only shall receive a
recorded announcement
informing him that he
has been nominated to pay call charges for the transferred call
and advising him on the signal to give if he agrees to pay call
charges. If he does not agree he should clear. If he agrees, a call
path shall be established between B and C, the charges for this call
being debited to whichever of these is the elected subscriber, and
Subscriber A shall be released.
.LP
     If a clear condition from the elected subscriber is detected the connections
between A, B and C shall be released.
\v'3p'
.LP
    6)
    \fICharging principles\fR
.LP
    The subscriber originating a call, whether an original or
enquiry call, shall incur the normal charges for that call.
.LP
    Periods when a subscriber is in the suspended call path
state shall be considered as chargeable time.
.LP
     It shall be possible to impose, in addition to normal call charges as
described, a fixed fee debited to Subscriber A on
selection of any one of the three options available. The fee shall be
determined by:
.LP
    i)
    the option selected;
.LP
    ii)
    any previous option selected.
.LP
    In addition to the call fixed fee charges, it should be
possible to impose on Subscriber A a periodic charge while
hold\(hyfor\(hyenquiry or 3\(hyparty connection options are in use. It shall be
possible to apply different periodic charges to each of these options.
.LP
    When a call is released, charging for that call shall
cease.
.LP
     Following the call transfer, charges shall be levied against the paying
subscriber at the rate applicable to a call set up normally
between the 2\ subscribers.
.sp 1P
.LP
1.16
    \fBconference call services\fR (11.2)
.sp 9p
.RT
.LP
    \fIF:\fR     \fIservice de communication conf\*'erence\fR
.LP
    \fIS:\fR     \fIservicio de comunicaci\*'on pluripartita (o de\fR
\fIconferencia m\*'ultiple)\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     The service provides the possibility to connect a number of specified
subscribers on the same telephone call.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
    These services enable a subscriber to establish
connections simultaneously with more than one subscriber
using a common speech path. The calls may be set up by an
operator, or the information for setting up the call may be
registered by the Administration, but leaving it to the
subscriber either to activate the call or to control it
completely. Where the services are fully subscriber
controlled, the calls can be set up simultaneously or
sequentially.
.LP
    Conference calls
are normally of two types:
.LP
    \(em
    bidirectional calls in which each
participant can listen and speak whenever he wishes to
intervene in the conversation;
.LP
    \(em
    unidirectional calls in which only one of the
participants can speak, the other participants being able
only to listen.
.LP
     However, a conference call may consist of a combination of both types
of call defined above.
\v'3p'
.bp
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR \v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
     There seems to be a need in future switching systems for an automatic
service which does not require operator assistance in
setting up conference calls. Any such automatic service should
provide security facilities to prevent unauthorized access.
.LP
    The number of participants may be limited for operation
and/or transmission or other technical reasons.
.LP
    There may be a certain demand for connection and
disconnection of participants during a conference call in progress.
.LP
    The customer is used to certain conveniences offered by
operator connected conference calls. Control procedures in
automatic service should therefore be both clear and simple.
\v'3p'
.LP
    6)
    \fICharging principles\fR
.LP
    (See Recommendations E.151 and D.110.)
.sp 1P
.LP
1.17
    \fBcalling number indication\fR (14.3)
.sp 9p
.RT
.LP
    \fIF:\ service d'indication du num\*'ero du demandeur\fR
.LP
    \fIS:\ servicio de indicaci\*'on del n\*'umero del abonado que\fR
\fIllama\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    A service whereby the calling subscriber's number can be
identified by means of a visual or verbal indication at the
called terminal.
.LP
    No variants have been identified so far.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    The service could cause
ineffective use of the
network
(repeat attempts or long holding times) should the
called subscriber refuse to answer the call because he is
informed of the calling subscriber's number.
.LP
    The service requires extended interexchange and local
network signalling to enable transmission of the calling
subscriber's number.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
1.18
    \fBsubscriber's alpha\(hynumerical display\fR (14.4)
.sp 9p
.RT
.LP
    \fIF:\fR     \fIservice d'affichage alphanum\*'erique de renseignements\fR
\fIrelatifs aux abonn\*'es\fR
.LP
     \fIS:\fR \fIservicio de visualizaci\*'on alfanumerica en el aparato\fR
\fItelef\*'onico\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     The visual display at a subscriber's telephone terminal of information
sent to or received from the public telephone
network. This display comprises outgoing and/or incoming
information.
.LP
    No variants have been identified so far.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Applications regarding outgoing information are suitable.
.LP
     Regarding incoming information, the same problem applies for this service
as for the calling number indication service.
.LP
    There may also be a need to indicate the calling subscriber's
name.
\v'3p'
.LP
    4)
    \fIMarket data\fR .bp
.sp 1P
.LP
1.19
    \fBprivate number ringing signal\fR
.sp 9p
.RT
.LP
    \fIF:\ service de signal d'appel d'un num\*'ero\fR
\fIparticulier\fR
.LP
    \fIS:\ servicio de se\o"n~"al de llamada individualizada\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     Each member of a family is given different identification (ID)\ codes.
If the calling party wants a particular member he dials the
ID\ code related to that member. The called member can know he is wanted
by a particular kind of ringing signal.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Requires extended interexchange and possibly local network
signalling.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
1.20
    \fBvoice mailbox service (VMS)\fR
.sp 9p
.RT
.LP
    \fIF:\ service de boite aux lettres t\*'el\*'ephonique\fR
.LP
    \fIS:\ servicio de buz\*'on telef\*'onico\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    (Under study.)
\v'3p'
.LP
    2)
    \fIGeneral Description\fR
.LP
     Recent advances in technology have allowed the voice mailbox to evolve
and market research has indicated a potential for this type
of service.
.LP
    The
renter of a mailbox
(subscriber) is provided
with a
mailbox telephone number
which he can publicize to customers,
clients, business associates, friends,\ etc.
.LP
    Callers are answered by a personalized announcement which
can either invite the caller to leave a message or impart information.
.LP
    As an optional feature of VMS, the mailbox may
be programmed to alert a
radiopager
each time a message is left in
the mailbox or to call certain telephone numbers and deliver messages.
.LP
    The subscriber may retrieve his messages either from a
push button
phone by dialling the same number as callers and then
entering a security code and system command or, by dialling an
alternative number (known only to him) from a rotary dial phone.
.LP
    Retrieval from
push button phones
allows
sophisticated control of message playback and mailbox facilities, e.g.\
repeat message, retain message, switch pager on/off, switch recording
service on/off, change personalized announcement, etc. These
facilities can be provided from rotary dial phones if the subscriber
has a hand\(hyheld tone generator. Otherwise retrieval from
rotary dial
phones
may be limited to simple one\(hytime playback of all messages
in the mailbox.
.LP
    Systems may allow tailoring of individual mailboxes to
meet subscribers' needs regarding message length, number of messages
stored at any one time, retention period, etc.
.LP
     The number of simultaneous calls to a subscriber's mailbox is limited
only by the capacity of the VMS equipment, e.g.\ a 32 port
system could theoretically be handling 32 simultaneous calls to the
same mailbox number.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    VMS offers the following benefits:
.LP
    \(em
     elimination of successive reciprocal call attempts in order to establish
a single communication;
.LP
    \(em
    elimination of time\(hyzone constraints;
.LP
    \(em
    optional indication on a radiopager whenever a message  is left;
.bp
.LP
    \(em
    retrieval at the convenience of the subscriber;
.LP
    \(em
    access to people on the move;
.LP
    \(em
    24\(hyhour service;
.LP
    \(em
    no need to talk to callers directly;
.LP
    \(em
    messages heard in the caller's own voice.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    Although services may initially have close ties with
radiopaging, they are likely to rapidly evolve a separate identity
and be sold on the strength of their own intrinsic benefits.
\v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
    (Under study.)
\v'3p'
.LP
    6)
    \fICharging principles\fR
.LP
    Initially subsets of a wide range of facilities may be
contained in the service offerings at fixed periodic tariffs. The
offerings may be elaborated in the light of customer reaction. The
tariffs may be increased as additional facilities are opted for and
usage sensitive billing may be introduced to account for variations
in message length, message holding time, overcalls and computer
resource usage.
.sp 2P
.LP
\fB2\fR     \fBSupplementary services without implications for the\fR
\fBinternational service\fR
.sp 1P
.RT
.sp 1P
.LP
2.1
    \fBabbreviated dialling services\fR (1.1)
.sp 9p
.RT
.LP
    \fIF:\ service de num\*'erotation abr\*'eg\*'ee\fR
.LP
    \fIS:\ servicio de marcaci\*'on abreviada\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     The possibility for a subscriber to make a call by dialling a short code
instead of the full telephone number.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
    Subscribers may have certain telephone numbers stored by
the telephone network and each of these numbers is given a
corresponding abbreviated number. The stored numbers may be
local, national and international. When a short code which
includes the abbreviated number is dialled, it is converted
by the network into the called subscriber's telephone number.
The call is then processed as a normal telephone call.
Abbreviated dialling may be available on demand or on a
subscription basis. The number registration can be done either
by the subscriber, or, on request, by the Administration.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
     Although this service can be provided from the exchange, in many cases
it can be provided by sophisticated subscriber
terminals.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    Many Administrations are planning to provide this service.
.sp 1P
.LP
2.2
    \fBalarm call services\fR (2.1)
.sp 9p
.RT
.LP
    \fIF:\ service du r\*'eveil\fR
.LP
    \fIS:\ servicio de despertador\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    The possibility for a user to cause an
alarm call
or calls to be made to his line at a time or times specified in advance
by him, and to hear an appropriate announcement when the call is
answered.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
    The user can order the network to call his line at times
specified by him; upon answer of the call the user will get an
appropriate
verbal announcement
indicating the character of the
call.
.bp
.LP
    The alarm call service may be offered on a manual,
semiautomatic or automatic basis.
.LP
    To meet different subscriber needs the services may be
offered on either an occasional or regular use basis, viz:
.LP
    \(em
    The occasional alarm call service covers only the
24\(hyhour period immediately following the time at which the
call was booked. The subscriber, however, may have the
possibility to order more than one alarm call to be made
to his line within a 24\(hyhour period.
.LP
    \(em
    The regular alarm call service covers a number of
24\(hyhour periods. The subscriber can order the alarm calls
to be made either every day for a specified number of
days, or on specified days of the calendar week for a
specified number of weeks. The days of a calendar week may
be chosen as consecutive days or according to an
established order.
.LP
    The services are available to subscribers without
prearrangement with the Administration.
.LP
     In principle, the manual and the semiautomatic forms of the service offer
the same possibilities as the automatic versions.
Unlike the automatic forms, however, the manual and the
semiautomatic forms would require no special subscriber
procedures to meet the subscriber needs in question.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    The service is wholly provided within the local exchange.
.LP
     It is an automation of an existing manual service which has been available
for many years.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.3
    \fBautomatic booked call\fR (2.2)
.sp 9p
.RT
.LP
    \fIF:\ service de demande automatique d'une communication\fR
.LP
    \fIS:\ servicio de llamadas autom\*'aticas prefijadas\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    With prior information from a subscriber, a call may be made
automatically from his telephone termination, to a particular number or
service (excluding the alarm call service) at a specific date and time.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Service wholly provided within the local exchange. Will require
special memory capacity.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.4
    \fBdiary service\fR (2.3)
.sp 9p
.RT
.LP
    \fIF:\ service de rappel de date\fR
.LP
    \fIS:\ servicio de agenda\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     With prior indication from a subscriber, a call is made automatically
to his telephone number at a specific date and time, and when an answer
condition is detected a recorded message is connected to this telephone
termination to remind him of a particular event, e.g.\ birthday of a relative.
Two versions of the series are envisaged:
.LP
    a)
    the recorded message is dictated by the subscriber in
each case;
.LP
    b)
    the recorded message is selected from a variety of
pre\(hystored messages.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Wholly local exchange based; requires long\(hyterm storage of
information.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.5
    \fBrestriction in the outgoing direction service\fR (3.1)
.sp 9p
.RT
.LP
    \fIF:\ service de limitation des communications de d\*'epart\fR
.LP
    \fIS:\ servicio de restricci\*'on de llamadas salientes\fR \v'3p'
.bp
.LP
    1)
    \fIDefinition\fR
.LP
    The possibility for a subscriber to prevent all or certain
outgoing calls and/or service control operations from his telephone
line.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     These services are used by subscribers to prevent unauthorized use of
their telephone lines. When the restriction is activated all calls or calls
to certain destinations are blocked. Keys or keywords are required for
deactivation. Incoming calls are received normally.
.LP
    The restrictions can be either permanently applied to a line by the
Administration on the request of the subscriber, or applied to a line by the
subscriber without the assistance of the Administration.
.LP
    In the case of subscriber control, the subscriber can either just
switch the restriction on and off, or select the type of restriction
when he activates the service.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
     Purely local service. Could be provided as PBX\ features. Emergency calls
may be excluded.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.6
    \fBPBX line hunting services\fR (12.2)
.sp 9p
.RT
.LP
    \fIF:\ service de recherche de ligne libre dans un commutateur\fR
\fIpriv\*'e\fR
.LP
    \fIS:\ servicio de captura de l\*'inea (l\*'ineas de salto)\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    The automatic selection of a free line from a
group of lines
serving a subscriber
, on receipt of a call to that subscriber's general
directory number.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
    Line hunting may take the following two main forms:
.LP
    a)
    sequential search where the search for a free line always
starts with the same line and then follows a fixed order;
.LP
    b)
    random search where the search for a free line does not
start with the same line each time. This covers a range of search
procedures,\ e.g.:
.LP
    \(em
    random start point and then fixed order;
.LP
    \(em
    start point is the last seized line plus one and then
fixed order,\ etc.
.LP
     The hunting procedures are only initiated when the general directory
number\ (GDN) is called. One line in the group is directly associated with
the\ GDN, the other individual lines in the group may also be allocated
normal individual telephone numbers and when these other individual numbers
are
called, the calls are processed in the normal way, without hunting.
.LP
     The subscriber may, under certain conditions, have the ability to reduce
the number of lines forming the group or, alternatively, inhibit the
automatic selection, or switch from random to sequential hunting.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Purely local service.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    Required by nearly all multi\(hynumber group users.
.sp 1P
.LP
2.7
    \fBsubscriber call charge meter\fR (7.1)
.sp 9p
.RT
.LP
    \fIF:\ service d'indicateur de taxe au domicile de l'abonn\*'e\fR
.LP
    \fIS:\ servicio de contadores de tasas en el domicilio del abonado\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    Meters at the subscriber's premises showing call charge units
debited.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.bp
.LP
    3)
    \fIRemarks\fR
.LP
    Provided from local exchange.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    A service used extensively
.sp 1P
.LP
2.8
    \fBautomatic verbal announcement of charges applied
service\fR (7.2)
.sp 9p
.RT
.LP
    \fIF:\fR     \fIservice d'indication automatique verbale des\fR
\fI\*'el\*'ements de taxation\fR
.LP
    \fIS:\fR     \fIservicio de indicaci\*'on autom\*'atica verbal de la\fR
\fItasa de la comunicaci\*'on\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    The possibility for a user to request a verbal announcement of
either total or individual call charges.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     A user may request an announcement giving the charge for a call, each
call of a series or the total call charges registered against his line.
The
request may be made before, during or after a call.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Provided from local exchange.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    Automation of an existing manual service (AD and C) with
extensions to cover more than one call. Usage likely to be high.
.sp 1P
.LP
2.9
    \fBprinted record of duration and charge of calls service\fR (7.3)
.sp 9p
.RT
.LP
    \fIF:\fR     \fIservice d'enregistrement \*'ecrit des \*'el\*'ements de\fR
\fItaxation\fR
.LP
     \fIS:\fR \fIservicio de registro impreso de la duraci\*'on y la tasa\fR
\fIde las comunicaciones\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     The possibility for a subscriber to get a specific printed record of
called number, duration and charge of calls.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     These services make it possible for the subscriber to get a specific
printed record on, for example, charges imposed on him for normal telephone
calls and/or possibly supplementary services.
.LP
     The services imply storage and/or printout of data on a suitable media
within the network. The data or part of it will be made available to the
subscriber normally in the form of a printed record.
.LP
    Manual, semiautomatic or automatic services are offered.
.LP
     Services may either be fully Administration controlled, or partly or
fully subscriber controlled.
.LP
     The category may either be fixed\(hyprogrammed by the Administration
at provision or selected by the subscriber at his activation of the service.
.LP
    The fully subscriber controlled services imply printout of data for
all calls of a certain category or for any particular (outgoing) call chosen
by the subscriber. The requests for printout of data for a particular call
can be made before, during or after a call.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    A service to provide subscribers with itemized billing of all
calls. Provided from local exchange.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    Demand for this service could be significant.
.bp
.sp 1P
.LP
2.10
    \fBautomatic credit card service\fR (7.7)
.sp 9p
.RT
.LP
    \fIF:\ service automatique de cartes de cr\*'edit\fR
.LP
    \fIS:\ servicio autom\*'atico con tarjeta de cr\*'edito\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    Payment of call charges is made by placing a
credit card
in a specially adapted telephone or by calling the credit number. A telephone
bill will be sent to the credit card holder later.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    This service could create billing problems for Administrations.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.11
    \fBselective accounting\fR (7.10)
.sp 9p
.RT
.LP
    \fIF:\ service de comptabilit\*'e s\*'elective\fR
.LP
    \fIS:\ servicio de contabilidad selectiva\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    A number of separate telephone accounts are associated with an
exchange termination and the account to which charges for a particular
call are to be debited is identified when making the call.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
     Most likely from business users who need to differentiate on the allocation
of costs, e.g.\ legal professions.
.sp 1P
.LP
2.12
    \fBcustomer recorded information service\fR (8.3)
.sp 9p
.RT
.LP
    \fIF:\ service particulier d'information enregistr\*'ee\fR
.LP
    \fIS:\ servicio de informaci\*'on grabada por el abonado\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     This service gives to the customer the possibility of distributing information
transmitted from recording equipment to calling
subscribers.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
     Could be provided from local exchange based equipment or terminal equipment
at customer's premises.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.13
    \fBpublic recorded information service\fR (8.4)
.sp 9p
.RT
.LP
    \fIF:\ service public d'information enregistr\*'ee\fR
.LP
    \fIS:\ servicio de informaci\*'on p\*'ublica grabada\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    Recorded information of public interest
provided by the telecommunications Administrations, possibly in cooperation
with appropriate
public or private institutions, is given to subscribers calling the respective
service numbers.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Access to service may well be at the local exchange.
\v'3p'
.LP
    4)
    \fIMarket data\fR .bp
.sp 1P
.LP
2.14
    \fBemergency call service\fR (9.1)
.sp 9p
.RT
.LP
    \fIF:\ service d'appels d'urgence\fR
.LP
    \fIS:\ servicio de llamadas de emergencia\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     A caller is given a fast and easy means of giving information about an
emergency situation to the appropriate emergency organization (e.g.\ fire
department, police, ambulance).
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    An existing service.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    High demand.
.sp 1P
.LP
2.15
    \fBcentrex service\fR
.sp 9p
.RT
.LP
    \fIF:\ service centrex\fR
.LP
    \fIS:\ servicio c\*'entrex\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    The provision to subscribers, by means of a specially equipped
public telephone exchange, of services normally available only in\ PABXs
(e.g.\ automatic internal dialling, operators' desk, client access to network,
direct dialling\(hyin, transfer of calls).
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    North America and Japan have shown a high demand.
.LP
.sp 1P
.LP
2.16
    \fBbabyphone\fR (14.6)
.sp 9p
.RT
.LP
    \fIF:\ service d'appels \*`a destination d'un poste dont le\fR
\fIcombin\*'e est d\*'ecroch\*'e\fR
.LP
    \fIS:\ servicio de llamadas a un tel\*'efono descolgado\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     A service providing for a call to be made to a telephone in the \*Qoff
hook\*U condition for the purpose of
audible supervision at the called   subscriber's premises
.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Has local application only.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.17
    \fBtransmission of a verbal message\fR (14.1)
.sp 9p
.RT
.LP
    \fIF:\ service de transmission d'un message verbal\fR
.LP
    \fIS:\ servicio de transmisi\*'on de un mensaje verbal\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     At the request of a caller (whether a subscriber or not), a short message
is transmitted by an operator, either to one or several telephone
numbers at a specified time, or to a specified person (whether a subscriber
or not) when he calls the operator.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.bp
.LP
    3)
    \fIRemarks\fR
.LP
    Could be provided locally or on a national basis.
.LP
    Has charging and accounting implications.
.LP
    Could be an automated service.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.18
    \fBuniversal access number\fR (14.5)
.sp 9p
.RT
.LP
    \fIF:\ service de num\*'eros universels\fR
.LP
    \fIS:\ servicio de n\*'umeros universales\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     A customer with several installations in different parts of the country
can be reached from anywhere in the country by dialling one given
number. Calls from subscribers on exchanges in predetermined areas of the
country will be routed to installations chosen (with certain restrictions)
for the area in question by the customer having the service.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Requires cost/demand study before agreement.
.LP
    Has numbering problems.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.19
    \fBmessage relay\fR (14.7)
.sp 9p
.RT
.LP
    \fIF:\ service de transmission de messages\fR
.LP
    \fIS:\ servicio de retransmisi\*'on de mensajes (mensaje diferido)\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     A caller, whether a subscriber or not, may dictate a message into recording
equipment and require that it is passed to a particular telephone
number by the following morning.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.20
    \fBinterruption of a call in progress\fR (6.7)
.sp 9p
.RT
.LP
    \fIF:\ service d'interruption d'une conversation en cours\fR
.LP
    \fIS:\ servicio de llamada preferente\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     Intervention by an operator, interrupting a call in progress, in order
to allow another incoming call to be offered.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Manual \*Qcall waiting\*U service.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    Low demand.
.sp 1P
.LP
2.21
    \fBfixed destination call services\fR (1.2)
.sp 9p
.RT
.LP
    \fIF:\ service d'appels \*`a destination fixe\fR
.LP
    \fIS:\ servicio de llamada de l\*'inea directa\fR \v'3p'
.bp
.LP
    1)
    \fIDefinition\fR
.LP
    The possibility for a subscriber to set up a call to a
predetermined telephone number by lifting the handset only.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     When the subscriber lifts the handset or the lifting condition is given
by automatic equipment, the exchange sets up automatically either
immediately or after a time\(hyout a connection to a predetermined telephone
number. This telephone number may be local, national, international, or the
number of an operator service. The \fIfixed destination call\fR may be
available on demand or on a subscription basis. The number registration
can be done either by the subscriber, or, on request, by the Administration.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Beneficial to the aged and handicapped.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.22
    \fBpick\(hyup facility\fR (10.2)
.sp 9p
.RT
.LP
    \fIF:\ service de prise d'une communication \*'etablie\fR
.LP
    \fIS:\ servicio de facilidad de telecaptura\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     A subscriber being away from his telephone can pick up a call on his
line by dialling his own number and/or possibly a special code from any
other telephone, after having been informed by means of a paging system
that there is such a call.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Mainly applies to\ PABXs or closed user groups.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.23
    \fBcall waiting services\fR (6.4)
.sp 9p
.RT
.LP
    \fIF:\ service d'appels en instance\fR
.LP
    \fIS:\ servicios de indicaci\*'on de llamada en espera\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     A subscriber engaged on an existing call is given an indication that
a caller is attempting to obtain connection to his
number.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
    A subscriber\ A engaged on an existing call with subscriber\ B is given
an indication that a caller, subscriber\ C, is attempting to obtain connection.
Subscriber\ A may answer by replacing the handset (acceptance by clearing).
Alternatively, he may ignore or reject the indication and continue with the
.LP
existing call, terminate the existing call and answer subscriber\ C or
hold the existing call and answer subscriber\ C (acceptance without clearing).
.LP
    The call waiting indication may be controlled by the called
subscriber or the calling subscriber.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    A possible variation where the calling rather than the called
subscriber controls the service is considered undesirable.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    Medium interest shown in USA.
.bp
.sp 1P
.LP
2.24
    \fBdual telephone numbers\fR
.sp 9p
.RT
.LP
    \fIF:\ service de num\*'eros de t\*'el\*'ephone doubles\fR
.LP
    \fIS:\ servicio de duplicidad de n\*'umeros telef\*'onicos\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    Two telephone numbers are given to one subscriber. One number
is known to the public while the other is revealed by the subscriber only
to a limited number of persons. When the subscriber applies call diversion
or do not disturb services to the first number, the people using the second
number will still be connected.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.25
    \fBvoice dialling\fR
.sp 9p
.RT
.LP
    \fIF:\ service de num\*'erotation par la voix\fR
.LP
    \fIS:\ servicio de marcaci\*'on por la voz\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    Verbal indication of a telephone number or name activates call
set\(hyup without the dialling operation.
.LP
    Could be implemented in the exchange or in subscriber terminal
equipment.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.26
    \fBnumber repetition service\fR (6.2)
.sp 9p
.RT
.LP
    \fIF:\ service de r\*'ep\*'etition de num\*'ero\fR
.LP
    \fIS:\ servicio de repetici\*'on del \*'ultimo n\*'umero marcado\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     The possibility for the subscriber to repeat a previously dialled number
by dialling a short code.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     The service can be provided in a form where either the subscriber requests
the registration of the number if the call cannot be completed, or the
number of each outgoing call is registered automatically. The subscriber
can
repeat this number by dialling a short code.
\v'3p'
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
2.27
    \fBlecture call\fR (11.3)
.sp 9p
.RT
.LP
    \fIF:\ service de communication conf\*'erence unilat\*'erale\fR
.LP
    \fIS:\ servicio de conferenc\*'ia m\*'ultiple unidireccional\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    A lecture call is an established connection between one caller and two
or more parties, in which the speech path is used in a unidirectional way
from the caller to the other connected parties. The call may be set up
either by an operator, or by an automatic device programmed by the caller
from his own
telephone.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR .bp
.ce 1000
APPENDIX\ I
.ce 0
.ce 1000
\fBTelephone services, considered as nonsupplementary\fR
.sp 1P
.RT
.ce 0
.PP
(These services appeared in earlier lists of supplementary
services)
.sp 1P
.RT
.sp 1P
.LP
I.1
    \fBpayphone service\fR (7.8)
.sp 9p
.RT
.LP
    \fIF:\ service publiphone\fR
.LP
    \fIS:\ servicio telef\*'onico de previo pago\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     A service offered by means of a special equipment permitting outgoing
telephone calls after insertion of adequate coins, tokens or coded cards
and, without payment, incoming calls. Outgoing calls to certain services
(e.g.\ emergency service) may be admitted without payment.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Includes public telephones and private telephones, which may be
used in two modes, \*Qprivate mode\*U and \*Q
coin\(hybox
mode\*U.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.LP
    High interest.
.sp 1P
.LP
I.2
    \fBdirectory inquiry service\fR (8.1)
.sp 9p
.RT
.LP
    \fIF:\ service de renseignements concernant les listes d'abonn\*'es\fR
.LP
    \fIS:\ servicio de informaci\*'on sobre gu\*'ias telef\*'onicas\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     Callers can be informed of subscribers' telephone numbers, and, possibly,
also of their names and addresses.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    See Question 2/II [3].
\v'3p'
.LP
    4)
    \fIMarket aspects\fR
.sp 1P
.LP
I.3
    \fBgeneral telecommunications information service\fR (8.2)
.sp 9p
.RT
.LP
     \fIF:\ service de renseignements g\*'en\*'eraux sur les t\*'el\*'ecommunications\fR
.LP
    \fIS:\ servicio de informaci\*'on general sobre telecomunicaciones\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
     A service given by an operator or a machine using the most common languages
explaining the telecommunciations services and facilities in a
country.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR \v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
I.4
    \fBinterception of calls\fR (13.1)
.sp 9p
.RT
.LP
    \fIF:\ service d'interception d'appels\fR
.LP
    \fIS:\ servicio de interceptaci\*'on de llamadas\fR \v'3p'
.bp
.LP
    1)
    \fIDefinition\fR
.LP
     Calls which, for reasons such as those listed below, cannot reach the
wanted number may be intercepted and diverted to an operator, an answering
machine, or a tone to give the caller the appropriate
information:
.LP
    \(em
    change of a particular number including indication of new
number;
.LP
    \(em
    renumbering of a group of numbers or a change of dialling
code;
.LP
    \(em
    wrong information in
telephone directory
;
.LP
    \(em
    dialling of an
unallocated code
;
.LP
    \(em
    dialling of a number or numbers allowed by the
numbering  plan
but not yet allocated or no longer in service;
.LP
    \(em
    route(s) out of order
;
.LP
    \(em
    route(s) congested
;
.LP
    \(em
    subscriber's line temporarily out of order
;
.LP
    \(em
    suspension of service owing to
nonpayment
.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Indication signals should be standardized to be useful for
foreign subscribers.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
I.5
    \fBpriority\fR (6.5)
.sp 9p
.RT
.LP
    \fIF:\ service de priorit\*'e\fR
.LP
    \fIS:\ servicio de prioridad\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    In telephone exchanges provision is made to give preferential
treatment concerning the order of path or circuit selection to certain
calls.
\v'3p'
.LP
    2)
    \fIDescription\fR \v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    For exceptional overload conditions, Administrations should
control priority arrangements for essential services.
\v'3p'
.LP
    4)
    \fIMarket data\fR
.sp 1P
.LP
I.6
    \fBmalicious call identification services\fR (14.2)
.sp 9p
.RT
.LP
    \fIF:\ service d'identification d'appels malveillants\fR
.LP
    \fIS:\ servicio de identificaci\*'on de llamadas maliciosas\fR \v'3p'
.LP
    1)
    \fIDefinition\fR
.LP
    At the discretion of the Administration, assistance is given to
ascertain the origin of
malicious, nuisance or obscene calls
.
\v'3p'
.LP
    2)
    \fIDescription\fR
.LP
     After prearrangement with the Administration, a subscriber will be given
the possibility to request identification of calls received by him. The
service may be provided by manual intervention or automatic means and may
be
offered on all calls or only certain calls specified by the subscriber. The
data received at the identification (calling subscriber's number, identity
of the incoming line, time of the incident,\ etc.) will be made available
to the
Administration.
\v'3p'
.LP
    3)
    \fIRemarks\fR
.LP
    Used on an international basis, the service requires
agreement among the countries involved. To allow flexible use,
the interexchange signalling must allow sending of the calling
subscriber's number.
\v'3p'
.bp
.LP
    4)
    \fIMarket data\fR \v'3p'
.LP
    5)
    \fIGeneral operational requirements\fR
.LP
    The use of the services may be restricted due to certain legal
requirements which may differ from country to country.
.LP
    The manual service can normally be provided to a limited extent
depending on the existing administrative and technical
possibilities.
.LP
    Modern exchange and signalling systems make it possible to
provide automatic services with extended possibilities regarding
identification of the caller's number.
.LP
    The services shall be provided and withdrawn after prearrangement
between the subscriber and the Administration in accordance with
national legal requirements.
.LP
    Provision of the service on an international basis requires
agreement between the Administrations concerned.
.LP
    Among the automatic services, those which allow request by the
subscriber during a call are preferred.
.LP
.sp 2P
.LP
    \fBReferences\fR
.sp 1P
.RT
.LP
[1]
     CEPT \fIHandbook on services and facilities offered to the subscribers\fR
\fIin modern telephone systems\fR
.LP
[2]
    CCITT \(em Question 16/II, Contribution COM II\(hyNo.\ 1, Study Period
1985\(hy1988, Geneva,\ 1985.
.LP
[3]
    CCITT \(em Question 2/II, Contribution COM II\(hyNo.\ 1, Study Period
1985\(hy1988, Geneva,\ 1985.
.LP
.rs
.sp 33P
.LP
.bp
.sp 2P
.LP
\fBSupplement\ No.\ 2\fR
.RT
.sp 2P
.sp 1P
.ce 1000
\fBVARIOUS\ TONES\ USED\ IN\ NATIONAL\ NETWORKS\fR
.EF '%    Fascicle\ II.2\ \(em\ Suppl.\ No.\ 2''
.OF '''Fascicle\ II.2\ \(em\ Suppl.\ No.\ 2    %'
.ce 0
.sp 1P
.LP
.rs
.sp 47P
.ad r
\fBTable Suppl. No. 2 p.344  MONTAGE\fR \ \ resserrer le titre pour faire
rentrer le tableau
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBTable Suppl. No. 2 cont'd. p.345 \fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBTable Suppl. No. 2 cont'd. p.346\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBTable Suppl. No. 2 cont'd. p.347\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBTable Suppl. No. 2 p.348\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBTable Suppl. No. 2 p.349\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBTable Suppl. No. 2 cont'd. p.350\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBTable Suppl. No. 2 cont'd. p.351\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBTable Suppl. No. 2 fin p.352\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBNotes du Tableau Suppl. No. 2, p.353\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 1P
.ce 1000
\fBSymbols used in compiling tone tables\fR
.sp 1P
.RT
.ce 0
.sp 1P
.LP
.rs
.sp 12P
.ad r
\fBTABLEAU, p.354\fR
.sp 1P
.RT
.ad b
.RT
.LP
     \fIf\fR\d1\u\(mu \fIf\fR\d2\u means that \fIf\fR\d1\uis modulated by
\fIf\fR\d2\u.
.LP
     \fIf\fR\d1\u+ \fIf\fR\d2\u means the juxtaposition of two frequencies
\fIf\fR\d1\uand
\fIf\fR\d2\uwithout modulation.
.LP
    \fIf\fR\d1\u/
\fIf\fR\d2\u    means that \fIf\fR\d1\uis followed
by \fIf\fR\d2\u.
.LP
    \fIf\fR\d1\u//
\fIf\fR\d2\u    means that in some exchanges frequency
\fIf\fR\d1\uis used and in others frequency \fIf\fR\d2\uis
used.
\v'2P'
.sp 2P
.LP
\fBSupplement\ No.\ 3\fR
.RT
.sp 2P
.sp 1P
.ce 1000
\fBNORTH\ AMERICAN\ PRECISE\ AUDIBLE\ TONE\ PLAN\fR
.EF '%    Fascicle\ II.2\ \(em\ Suppl.\ No.\ 3''
.OF '''Fascicle\ II.2\ \(em\ Suppl.\ No.\ 3    %'
.ce 0
.sp 1P
.PP
Table 1 is a description of the
audible tone
plan in operation  in the North American network to:
.sp 1P
.RT
.LP
    1)
    achieve uniformity in the quality of audible tones;
.LP
    2)
    minimize customer and operator confusion as to meaning of
audible tones;
.LP
    3)
     enable machine recognition of audible tones for purposes of service observing,\
etc.
.PP
Basically, the plan provides four frequencies that are used,
singly or in combination with particular cadences, to form the audible tone
signals shown in Table\ 1 as well as some other special purpose, limited use
signals.
.LP
.rs
.sp 10P
.LP
.bp
.ce
\fBH.T. [T1.3]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ 1
.TE
.TS
center box;
c | c s s s | c | c , ^  | c | c | c | c | ^ | ^ .
Tones       {
Frequencies | ua\d\u)\d (Hz)
 }     {
Power per frequency at exchange | ub\d\u)\d where
tone is applied | uc\d\u)\d
 }    Cadence
    350      440      480      620
_
.T&
l | c | c | l | l | c | l .
Dial tone    \(bu    \(bu            \(em | 3 dBm0    Continuous tone
 {
Dial tone \(em Modern PABX only
 }    \(bu    \(bu             {
 | ud\d\u)\d
\(em | 6 dBm0 | ud\d\u)\d
 }    Continuous tone
Recall dial tone    \(bu    \(bu            \(em | 3 dBm0     {
3 bursts of 0.1 s followed by a continuous tone | ue\d\u)\d
 }
 {
Recall dial tone \(em Modern PABX only | ug\d\u)\d
 }    \(bu    \(bu            \(em | 6 dBm0     {
3 bursts of 0.1 s followed by a continuous tone | ue\d\u)\d
 }
Busy tone            \(bu    \(bu    \(em | 4 dBm0    Burst 0.5 s/silence 0.5 s
 {
Busy tone \(em Modern PABX only
 }            \(bu    \(bu    \(em | 1 dBm0    Burst 0.5 s/silence 0.5 s
Reorder tone            \(bu    \(bu    \(em | 4 dBm0    Burst 0.25 s/silence 0.25 s
 {
Reorder tone \(em Modern PABX only
 }            \(bu    \(bu    \(em | 1 dBm0    Burst 0.25 s/silence 0.25 s
Audible ringing tone        \(bu    \(bu        \(em | 9 dBm0    Burst 2 s/silence 4 s
 {
Audible ringing tone \(em Modern PABX only
 }        \(bu    \(bu        \(em | 6 dBm0    Burst 1 s/silence 3 s
Call waiting tone        \(bu            \(em | 3 dBm0    Burst of 0.3 s every 10 s
 {
Call waiting tone \(em Modern PABX only | ug\d\u)\d
 }        \(bu            \(em | 6 dBm0     {
A burst of 0.3 s
 }
 {
Station call waiting
 }                     \(em | 6 dBm0     {
2 bursts of 0.1 s | ue\d\u)\d
Outside call waiting
 }
                    \(em | 6 dBm0     {
3 bursts of 0.1 s | ue\d\u)\d
Urgent call waiting
 }
Busy verification        \(bu            \(em | 3 dBm0     {
A 2.0 s burst followed by 0.5 s bursts every
10 s
 }
 {
Busy verification \(em Modern PABX only | ug\d\u)\d
 }        \(bu            \(em | 4 dBm0     {
Burst of 1.5 to 2.0 s followed by |  |  |  | uf\d\u)\d
 }
 {
Executive override \(em Modern PABX only | ug\d\u)\d
 }        \(bu            \(em | 4 dBm0    Burst of 3.0 s
Confirmation tone    \(bu    \(bu            \(em | 3 dBm0     {
Burst 0.1 s/silence 0.1 s/Burst
0.3 s
 }
 {
Confirmation tone \(em Modern PABX only | ug\d\u)\d
 }    \(bu    \(bu            \(em | 6 dBm0     {
3 bursts 0.1 s | ue\d\u)\d
 }
.TE
.LP
\ua\d\u)\d
Frequency limits are \(+- 0.5% of the nominal
frequency.
.LP
\ub\d\u)\d
PABX tone levels are measured at the PABX interfaces
(typically at customer premises). Power levels are 2\ dB lower
for private line interfaces.
.LP
\uc\d\u)\d
Power level tolerances are +1.5 dB.
.LP
\ud\d\u)\d
Tolerance level for PABX dial tone is +0.75 dB.
.LP
\ue\d\u)\d
Bursts are separated by 0.1 s.
.LP
\uf\d\u)\d
Burst of 1.5 to 2.0 s before attendant intervenes,
followed by repeated bursts of 0.5 to 0.8 s, 8 to 20 s apart.
.LP
\ug\d\u)\d
Tones applied at PABX station or private line interfaces and
not at the exchange interfaces.
.nr PS 9
.RT
.ad r
\fBTable 1 [T1.3] p.355\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 2P
.LP
\fBSupplement\ No.\ 4\fR
.RT
.sp 2P
.sp 1P
.ce 1000
\fBTREATMENT\ OF\ CALLS\ CONSIDERED\ AS\ \*QTERMINATING\ ABNORMALLY\*U\fR
.EF '%    Fascicle\ II.2\ \(em\ Suppl.\ No.\ 4''
.OF '''Fascicle\ II.2\ \(em\ Suppl.\ No.\ 4    %'
.ce 0
.sp 1P
.ce
\fBH.T. [1T1.4]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(342p) .
\fBSupplement No. 4\fR
.T&
cw(342p) .
 {
\fBTREATMENT\ OF\ CALLS\ CONSIDERED\ AS\ \*QTERMINATING\fR
\fBABNORMALLY\*U\fR
 }
.TE
.TS
center box;
cw(30p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
Country of destination      Ceased line      Line out of service      Changed number       {
Line connected
to absent
subscribers service
 }    Faulty line       {
Spare numbers (no\ subscriber)
 }    Spare level or spare code       {
Congestion in
the inland
automatic
system
 }
_
.T&
lw(30p) | cw(234p) | lw(42p) | lw(36p) .
Afghanistan    Ringing tone          Busy tone
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(120p) | lw(36p) .
Algeria    Operator or ringing tone      Busy tone      Operator       {
Operator or busy tone or ringing tone
 }    Busy tone
.T&
lw(30p) | cw(120p) | lw(36p) | lw(120p) | lw(36p) .
     {
Recorded announcement proposed
 }
_
.T&
lw(30p) | lw(78p) | lw(42p) | cw(36p) | lw(78p) | lw(78p) .
Argentina    Ringing tone       {
Normally operator; exceptionally, ringing tone
 }    \(em      Ringing tone      Busy tone
_
.T&
lw(30p) | lw(78p) | lw(78p) | lw(42p) | lw(36p) | lw(36p) | lw(42p) .
Australia     {
Operator, recorded announcement
or number unobtainable tone
 }     {
Operator or recorded announcement
 }     {
Ringing tone, busy tone
or recorded announcement
 }     {
Number unobtainable tone, ringing tone
or recorded announcement
 }     {
Recorded announcement or number unobtainable tone
 }     {
Congestion tone or recorded announcement
 }
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(78p) .
Austria     {
Operator or busy tone or special information tone, the
latter if necessary also at the initiative of the
operator
 }     {
Busy tone or special information tone
 }     {
Operator of recorded announcement or busy tone or special
information tone; the latter may also be transmitted during
the intervals of the announcement or if necessary on the
initiative of the operator
 }     {
Operator or recorded announcement or special information tone
to be transmitted during the intervals of the announcement
or on the initiative of the operator
 }    Ringing tone or busy tone       {
Busy tone or special information tone
 }    Busy tone
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau [1T1.4] A L'ITALIENNE, p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [2T1.4]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .

.T&
cw(30p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
Country of destination      Ceased line      Line out of service      Changed number       {
Line connected
to absent
subscribers service
 }    Faulty line       {
Spare numbers (no\ subscriber)
 }    Spare level or spare code       {
Congestion in
the inland
automatic
system
 }
_
.T&
lw(30p) | lw(42p) | lw(36p) | cw(42p) | lw(36p) | cw(42p) | lw(78p) | lw(36p) .
Bahamas    Recorded announcement       {
Recorded announcement or unobtainable tone
 }    \(em      Operator intercepted      \(em       {
Recorded announcement or unobtainable tone
 }    Fast busy tone
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Belgium     {
Operator. In certain cases, ringing tone
(information tone complemented by a recorded announcement
is proposed)
 }     {
Ringing tone.
In certain cases operator
 }     {
Operator for individual cases; recorded announcement
in case of transfer of groups of subscribers
 }    Operator       {
Ringing tone.
In certain cases information tone or
operator
 }     {
Ringing tone.
In certain cases recorded announcement
 }     {
Information tone with or without recorded announcement
 }     {
In certain cases congestion tone
 }
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
Brazil     {
Number unobtainable tone or recorded announcement
 }     {
Operator or number
unobtainable tone or recorded announcement
 }        Busy tone or ringing tone       {
Number unobtainable tone or recorded announcement or
operator
 }    Busy tone
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(120p) | lw(36p) .
Burundi    Information tone      Operator      Ringing tone or busy tone
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
Cameroon     {
Ringing tone or recorded announcement
 }    Ringing tone or operator      Ringing tone or busy tone       {
Recorded announcement or ringing tone
 }     {
Recorded announcement or busy tone
 }
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Canada     {
Operator or recorded announcement |
* | n many cases, the recorded announcement is followed by
cut\(hythrough to an operator
 }     {
New number from operator or automatic intercept
system
 }     {
Service usually provided by persons not in the employ
of the Telephone Company
 }     {
Operator, busy tone or ringing tone
 }     {
Operator or recorded announcement
 }     {
Operator, recorded announcement, busy tone, or re\(hyorder
(congestion tone)
 }     {
Re\(hyorder (congestion) tone or recorded announcement
 }
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(78p) .
Chile    Ringing tone       {
Ringing tone or recorded announcement
 }     {
Operator or recorded announcement
 }    Service not provided      Ringing tone or busy tone      Ringing tone      Busy tone
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau [2T1.4] A L'ITALIENNE, p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [3T1.4]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .

.T&
cw(30p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
Country of destination      Ceased line      Line out of service      Changed number       {
Line connected
to absent
subscribers service
 }    Faulty line       {
Spare numbers (no\ subscriber)
 }    Spare level or spare code       {
Congestion in
the inland
automatic
system
 }
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(156p) .
C\* | te d'Ivoire     {
Information tone with recorded announcement
 }     {
Service not provided. Ringing tone
 }     {
Information tone with recorded announcement
 }
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Cuba    Ringing tone       {
Operator for individual cases;
operator or recorded announcement in case of transfer of
groups of subscribers
 }    Service not provided      Ringing tone or busy tone      Ringing tone       {
Number unobtainable tone or congestion tone
 }    Busy tone
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | cw(36p) | lw(42p) | lw(78p) | lw(36p) .
Cyprus    Number unobtainable tone      Ringing tone      Operator      \(em      Busy tone or ringing tone      Number unobtainable tone      Busy tone
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Denmark     {
Information tone or ringing tone, or operator
or recorded announcement
 }     {
Operator or recorded announcement
 }    Ringing tone       {
Information tone or ringing tone
 }    Information tone      Busy tone
_
.T&
lw(30p) | lw(78p) | cw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | cw(36p) .
Djibouti    Ringing tone of low level      \(em      Service not provided      Ringing tone or busy tone      Ringing tone of low level      Busy tone      \(em
_
.T&
lw(30p) | lw(42p) | lw(78p) | lw(36p) | lw(42p) | lw(36p) | lw(78p) .
El Salvador    Busy tone      Ringing tone      Operator or ringing tone      Busy tone or ringing tone      Ringing tone      Busy tone
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Fiji     {
Operator or number unobtainable tone
 }    Number unobtainable tone       {
Operator or number unobtainable tone
 }    Service not provided       {
Number unobtainable tone. Continuous, busy
or ringing tone
 }    Ringing tone      Number unobtainable tone      Busy tone
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Finland     {
Ringing tone or operator or recorded announcement
 }     {
Ringing tone or busy tone or recorded announcement
 }     {
Operator or recorded announcement or ringing tone
 }     {
Operator or recorded announcement
 }    Ringing tone or busy tone      Ringing tone or busy tone       {
Busy tone or information tone
 }     {
Busy tone. In certain cases no tone
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau [3T1.4] A L'ITALIENNE, p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [4T1.4]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .

.T&
cw(30p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
Country of destination      Ceased line      Line out of service      Changed number       {
Line connected
to absent
subscribers service
 }    Faulty line       {
Spare numbers (no\ subscriber)
 }    Spare level or spare code       {
Congestion in
the inland
automatic
system
 }
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
France     {
Operator or recorded announcement
 }    Operator       {
Operator or recorded announcement or busy tone
or ringing tone
 }     {
Operator or recorded announcement or busy tone
or ringing tone
 }     {
Busy tone or recorded announcement
 }
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Germany (Federal Republic of)     {
Special information tone, alone or with a recorded announcement
(use according to Recommendation\ E.180)
 }     {
Operator or recorded announcement
 }    Ringing tone or busy tone       {
Ringing tone (alone without any other indication)
or special information tone, alone or with
recorded announcement
 }     {
Special information tone, alone or with a recorded announcement
(use according to Recommendation\ E.180)
 }    Busy tone, congestion tone
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
Ghana    Number unobtainable tone      Ringing tone and operator      Number unobtainable tone      Ringing tone or busy tone      Number unobtainable tone      Busy tone
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(78p) | cw(36p) .
Guinea    Ringing tone      Operator      Busy tone or ringing tone      Number unobtainable tone      \(em
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Hungary    Operator or ringing tone       {
Ringing tone or recorded announcement
 }    Operator      Busy tone or ringing tone      Ringing tone       {
Special information tone (Recommendation\ E.180)
 }    Busy tone
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(120p) | lw(36p) .
India    Number unobtainable tone       {
Operator or recorded announcement or number
unobtainable tone
 }    Service not provided      Number unobtainable tone      Busy tone
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
Ireland    Number unobtainable tone      Operator      Service not provided          Number unobtainable tone      Busy tone
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau [4T1.4] A L'ITALIENNE, p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [5T1.4]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .

.T&
cw(30p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
Country of destination      Ceased line      Line out of service      Changed number       {
Line connected
to absent
subscribers service
 }    Faulty line       {
Spare numbers (no\ subscriber)
 }    Spare level or spare code       {
Congestion in
the inland
automatic
system
 }
_
.T&
lw(30p) | lw(42p) | lw(78p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Israel         {
Information tone with a recorded announcement
 }        Busy tone or ringing tone       {
Information tone with a recorded announcement
 }    Busy tone       {
Busy tone alone or with a recorded announcement
 }
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(78p) .
Italy    Busy tone or ringing tone       {
Operator or recorded announcement
 }     {
Operator or recorded announcement
 }    Busy tone or ringing tone      Ringing tone      Busy tone
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
Jamaica     {
Number unobtainable tone or congestion tone or
recorded announcement
 }     {
Operator or recorded announcement
 }     {
Call answered by a private answering service
 }     {
Number unobtainable tone or congestion tone
or busy tone or ringing tone
 }     {
Number unobtainable tone or congestion tone or
recorded announcement
 }    Congestion tone or busy tone
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Japan     {
Recorded announcement or operator
 }     {
Recorded announcement or ringing tone
 }     {
Recorded announcement or busy tone or ringing tone
 }     {
Recorded announcement or operator
 }    Recorded announcement       {
Busy tone or recorded announcement
 }
_
.T&
lw(30p) | lw(78p) | lw(78p) | lw(120p) | lw(36p) .
Kenya    Number unobtainable tone      Operator      Number unobtainable tone      Busy tone
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Korea (Rep.\ of)     {
Ringing tone or recorded announcement
 }    Ringing tone or busy tone       {
Automatic intercept system or ringing tone
 }     {
Recorded announcement or ringing tone
 }    Busy tone or ringing tone       {
Ringing tone or recorded announcement
 }     {
Busy tone or recorded announcement
 }    Busy tone or congestion tone
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Lebanon     {
Ringing tone (recorded announcement proposed)
 }    Operator       {
Ringing tone (recorded announcement proposed)
 }    Ringing tone      Special tone      Busy tone
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau [5T1.4] A L'ITALIENNE, p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [6T1.4]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .

.T&
cw(30p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
Country of destination      Ceased line      Line out of service      Changed number       {
Line connected
to absent
subscribers service
 }    Faulty line       {
Spare numbers (no\ subscriber)
 }    Spare level or spare code       {
Congestion in
the inland
automatic
system
 }
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Liberia    Ringing tone      Service not provided      Busy tone or ringing tone      Ringing tone      Number unobtainable tone      Busy tone
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Luxembourg     {
Ringing tone or recorded announcement
or congestion tone
 }    Operator      Ringing tone or busy tone       {
Ringing tone or
congestion tone
 }     {
Busy tone or recorded announcement
 }    Busy tone or congestion tone
_
Unable to convert table
.TE
.nr PS 9
.RT
.ad r
\fBTableau [6T1.4], A L'ITALIENNE, p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [7T1.4]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .

.T&
cw(30p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
Country of destination      Ceased line      Line out of service      Changed number       {
Line connected
to absent
subscribers service
 }    Faulty line       {
Spare numbers (no\ subscriber)
 }    Spare level or spare code       {
Congestion in
the inland
automatic
system
 }
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Morocco     {
Ringing tone or recorded announcement
 }    Operator      Busy tone or ringing tone       {
Ringing tone or recorded announcement
 }     {
Busy tone or recorded announcement
 }    Busy tone
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(78p) | lw(42p) | lw(36p) | lw(78p) .
Mozambique    Ringing tone      Busy tone      Service not provided      Busy tone or ringing tone      Ringing tone      Busy tone
_
.T&
lw(30p) | lw(78p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Nauru    Ringing tone      Service not provided      Ringing tone or busy tone      Ringing tone      Number unobtainable tone      Busy tone
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Norway     {
Operator or recorded announcement or special
information tone or busy tone or ringing tone
 }     {
Operator or recorded announcement or special
information tone or busy tone
 }    Ringing tone or busy tone       {
Ringing tone or busy tone or special
information tone
 }     {
Special information tone or busy tone
 }    Congestion tone or busy tone
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Netherlands     {
Special information tone or recorded announcement
 }    Special information tone       {
Special information tone or recorded announcement
 }     {
Special information tone (Manual service);
recorded announcement (Automatic service)
 }    Ringing tone or busy tone       {
Special information tone or ringing tone
 }     {
Special information tone or congestion or
recorded announcement
 }    Congestion tone
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(120p) | lw(36p) .
New Caledonia     {
Operator or recorded announcement
 }    Operator       {
Operator or recorded announcement or busy tone
or ringing tone
 }     {
Busy tone or recorded announcement
 }
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
New Zealand     {
Number unobtainable tone or ringing tone
 }    Number unobtainable tone       {
Operator or recorded announcement
 }    Service not provided      Busy tone or ringing tone       {
Number unobtainable tone or ringing tone
 }    Number unobtainable tone       {
Disconnect or recorded announcement
 }
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Oman    Number unobtainable tone      Busy tone      Number unobtainable tone          Busy tone      Ringing tone      Number unobtainable tone      Busy tone
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau [7T1.4], A L'ITALIENNE, p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [8T1.4]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .

.T&
cw(30p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
Country of destination      Ceased line      Line out of service      Changed number       {
Line connected
to absent
subscribers service
 }    Faulty line       {
Spare numbers (no\ subscriber)
 }    Spare level or spare code       {
Congestion in
the inland
automatic
system
 }
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
Philippines     {
Ringing tone or busy tone; operator or
recorded announcement
 }    Operator      Ringing tone or busy tone       {
Busy tone; operator
recorded announcement
 }    Busy tone
_
.T&
lw(30p) | lw(198p) | lw(78p) | lw(36p) .
Poland    Ringing tone       {
Ringing tone or busy tone or special information tone
followed by recorded announcement
 }     {
Special information tone or busy tone
 }
_
.T&
lw(30p) | lw(156p) | lw(42p) | lw(36p) | lw(78p) .
Polynesia    Operator       {
Ringing tone or busy tone according to the fault
 }    Ringing tone      Busy tone
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Portugal     {
Busy tone or number unobtainable tone
 }     {
Busy tone or number unobtainable tone
 }     {
Operator or busy tone for individual cases;
recorded announcement in case of groups of subscribers
 }    Service not provided      Ringing tone or busy tone       {
Busy tone or number unobtainable tone
 }     {
Operator or busy tone or number unobtainable tone
 }    Busy tone
_
.T&
lw(30p) | lw(78p) | lw(78p) | lw(120p) | lw(36p) .
Qatar    Number unobtainable tone      Operator      Number unobtainable tone      Busy tone
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
Roumania     {
\*QSpare line tone\*U or operator
 }    Service not provided      Busy tone or ringing tone      \*QSpare line tone\*U      Busy tone
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
Singapore    Number unobtainable tone       {
Operator or recorded announcement
 }        Ringing tone or busy tone      Number unobtainable tone      Busy tone or congestion tone
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
South Africa    Number unobtainable tone       {
Operator or recorded announcement
 }        Ringing tone or busy tone      Number unobtainable tone      Busy tone
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(78p) | lw(36p) | lw(42p) | lw(36p) .
Spain    Special tone       {
Operator or recorded announcement
 }     {
Operator or recorded announcement
 }    Ringing tone      Special tone      Congestion tone
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau [8T1.4], A L'ITALIENNE, p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [9T1.4]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .

.T&
cw(30p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
Country of destination      Ceased line      Line out of service      Changed number       {
Line connected
to absent
subscribers service
 }    Faulty line       {
Spare numbers (no\ subscriber)
 }    Spare level or spare code       {
Congestion in
the inland
automatic
system
 }
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
Swaziland    Number unobtainable tone       {
Operator or recorded announcement
 }         {
Ringing tone or busy tone or number
unobtainable tone
 }    Number unobtainable tone      Busy tone
_
.T&
lw(30p) | lw(156p) | lw(42p) | lw(78p) | lw(36p) .
Sweden     {
Operator or information tone or recorded announcement
with information tone
 }     {
Ringing tone, busy tone or information tone or
recorded announcement with information tone
 }     {
Operator, or recorded announcement with information tone
or information tone
 }    Congestion tone or no tone
_
.T&
lw(30p) | lw(120p) | lw(36p) | lw(78p) | lw(78p) .
Switzerland     {
Operator or recorded announcement
 }    Operator      Ringing tone      Busy tone
_
.T&
lw(30p) | lw(156p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Suriname    Service not provided      Busy tone or ringing tone       {
Ringing tone or information tone
 }     {
Recorded announcement or busy tone
 }    Busy tone
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(78p) | lw(42p) | lw(36p) .
Syria     {
Ringing tone. Operator (proposed)
 }    Number unobtainable tone       {
Operator or ringing tone or recorded announcement
 }     {
Ringing tone. Operator (proposed)
 }    Ringing tone      \*QBarred level\*U tone      Busy tone
_
.T&
lw(30p) | lw(78p) | lw(78p) | lw(120p) | lw(36p) .
Tanzania    Number unobtainable tone      Operator      Number unobtainable tone      Busy tone
_
.T&
lw(30p) | lw(78p) | lw(78p) | lw(120p) | lw(36p) .
Uganda    Number unobtainable tone      Operator      Number unobtainable tone      Busy tone
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
USSR     {
Ringing tone \(em recorded announcement proposed
 }     {
Operator or recorded announcement proposed
 }     {
Recorded announcement proposed
 }    Busy tone or ringing tone      Ringing tone       {
Recorded announcement proposed
 }    Busy tone
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau [9T1.4], A L'ITALIENNE, p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [10T1.4]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .

.T&
cw(30p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
Country of destination      Ceased line      Line out of service      Changed number       {
Line connected
to absent
subscribers service
 }    Faulty line       {
Spare numbers (no\ subscriber)
 }    Spare level or spare code       {
Congestion in
the inland
automatic
system
 }
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
United Kingdom    Number unobtainable tone       {
Operator or recorded announcement
 }     {
Call answered by an operator or a private answering
service or a call transferred to another subscriber
 }     {
Number unobtainable tone or busy tone
 }    Number unobtainable tone       {
Equipment engaged tone or recorded announcement
 }
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
United States     {
Operator or recorded announcement |
 }     {
New number from operator or recorded announcement |
 }    Recorded announcement       {
Operator or recorded announcement
 }     {
Operator or recorded announcement |
 }     {
Operator or recorded announcement
 }     {
Recorder (congestion) tone or recorded announcement
 }
.T&
lw(312p) .
 {
* | n many cases, the recording is followed by cut\(hythrough
to an operator
 }
.T&
lw(30p) | lw(120p) | lw(36p) | lw(42p) | lw(36p) | lw(78p) .
Uruguay    Ringing tone      Operator      Ringing tone or busy tone      Ringing tone      Busy tone
_
.T&
lw(30p) | lw(78p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
Yugoslavia     {
Ringing tone; exceptionally special information tone
 }     {
Normally ringing tone; exceptionally, operator or
recorded announcement
 }        Ringing tone or busy tone       {
Ringing tone; exceptionally special information tone
 }     {
Busy tone or special information tone
 }    Busy tone
_
.T&
lw(30p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(78p) | lw(36p) .
Zambia    Number unobtainable tone       {
Number unobtainable tone or information tone
 }     {
Operator or special information tone
 }    Service not provided      Ringing tone or busy tone      Number unobtainable tone      Congestion tone
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau [10T1.4], A L'ITALIENNE, p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 2P
.LP
\fBSupplement\ No.\ 5\fR
.RT
.sp 2P
.ce 1000
\fBMODELLING\ OF\ AN\ EXPERIMENTAL\ TEST\ DESIGN\ FOR\ THE\ DETERMINATION\
OF\fR
.EF '%    Fascicle\ II.2\ \(em\ Suppl.\ No.\ 5''
.OF '''Fascicle\ II.2\ \(em\ Suppl.\ No.\ 5    %'
.ce 0
.ce 1000
\fBINEXPERIENCED\ \fR \fBUSER\ DIFFICULTIES\fR \fB\ IN\ SETTING\ UP\ INTERNATIONAL\fR
.ce 0
.ce 1000
\fBCALLS\ USING\ NATIONALLY\ AVAILABLE\ INSTRUCTIONS,\ OR\ TO\fR
.ce 0
.sp 1P
.ce 1000
\fBCOMPARE\ DIFFERENT\ SETS\ OF\ INSTRUCTIONS\fR
.ce 0
.sp 1P
.PP
During the Study Periods 1973\(hy1977 and 1978\(hy1980, a method was developed
for identifying the most important difficulties encountered by
inexperienced subscribers in dialing their own international calls. The same
method was then shown to be a good way to compare the effectiveness of
different sets of instructions.
.sp 1P
.RT
.PP
A full description of this method can be found in Supplement No. 5 in the
\fIRed Book\fR , Volume\ II, Fascicle\ II.2 published by the CCITT in\
1985.
.sp 2P
.LP
\fBSupplement\ No.\ 6\fR
.RT
.sp 2P
.sp 1P
.ce 1000
\fBPREPARATION\ OF\ INFORMATION\ TO\ CUSTOMERS\ TRAVELLING\ ABROAD\fR
.EF '%    Fascicle\ II.2\ \(em\ Suppl.\ No.\ 6''
.OF '''Fascicle\ II.2\ \(em\ Suppl.\ No.\ 6    %'
.ce 0
.sp 1P
.PP
Considering that some Administrations have found it desirable to
provide information, usually in the form of a pamphlet, for the guidance of
their customers who are planning to travel abroad, it is suggested that such
information should include:
.sp 1P
.RT
.LP
    i)
    information enabling the visitor to identify suitable
payphones
from which international telephone calls may be made in those countries
where not all payphones afford international call facilities;
.LP
    ii)
    operating procedure for payphones in the country visited
including dialling instructions for automatic calls, with an example of the
composition of the digits to be dialled, i.e.\
international prefix
,
country code
,
trunk code
(if necessary) and
subscriber's
number
. Special reference should be made to unfamiliar procedures and
particularly to the need to omit the
trunk prefix
used in the
destination country;
.LP
    iii)
    reference to the possibility that unfamiliar tones and
recorded announcements
may be encountered (see Annex\ A to
Recommendation\ E.121 which gives guidance in identifying such tones);
.LP
    iv)
    an indication when an
additional dialling tone
may
be encountered and definition of the point in the dialling sequence at
which it must be awaited;
.LP
    v)
    description of the paid\(hytime expiration warning signal.
.PP
Other useful information that may be considered desirable
for inclusion is the following:
.LP
    a)
    time differences between home country and the country to be  visited;
.LP
    b)
    the advantage of writing down the required international
telephone number before starting the call to minimize the risk
of a dialling error;
.LP
    c)
    information on how the traveller may be called from his home country.
.PP
Methods by which pamphlets may be distributed include provision of supplies
at airport departure lounges, through telecommunications publicity,
information points and travel agencies.
.PP
It should be noted that no evidence is yet available to indicate
whether the production of pamphlets does or does not contribute to the
successful completion of international telephone calls
.
.bp
.RT
.sp 2P
.LP
\fBSupplement\ No.\ 7\fR
.RT
.sp 2P
.sp 1P
.ce 1000
\fBDESCRIPTION\ OF\ INMARSAT\ EXISTING\ AND\ PLANNED\ SYSTEMS\fR
.EF '%    Fascicle\ II.2\ \(em\ Suppl.\ No.\ 7''
.OF '''Fascicle\ II.2\ \(em\ Suppl.\ No.\ 7    %'
.ce 0
.sp 1P
.LP
\fB1\fR     \fBStandard A system\fR
.sp 1P
.RT
.PP
The INMARSAT Standard A communications system has enabled INMARSAT to provide
maritime communications following the organization's inception in
February\ 1982. The primary function of the Standard\ A system is to provide
telephone, telex and some data services together with distress and
safety\(hyrelated traffic.
.RT
.PP
1.1
The Standard A system consists of the following major elements in an ocean
region:
.sp 9p
.RT
.LP
    a)
    the network coordination (NCS);
.LP
    b)
    coast earth station (CES);
.LP
    c)
    ship earth station (SES); and
.LP
    d)
    the space segment.
.PP
1.1.1
Three
network coordination stations
are provided in the Standard\ A system, one in each ocean region, managing
central resources such as allocating traffic channels on a demand assigned
basis and coordinating
signalling and control traffic.
.sp 9p
.RT
.PP
1.1.2
Each
coast earth station
serves as a gateway to and from the terrestrial network to ship earth stations
within the coverage area of the satellite. The types of terrestrial network
interfaces at a coast earth station are provided at the discretion of the
coast earth station operator.
.PP
1.1.3
The
ship earth station
interfaces the CES via the space
segment at L\(hyBand, and consists of two portions: above\(hydeck equipment and
below\(hydeck equipment. The above\(hydeck equipment consists of an antenna
with
stabilization and automatic steering equipment enabling the antenna beam to
remain pointed at a satellite, regardless of course and ship movements. The
below\(hydeck equipment consists of an antenna control unit, communications
electronics used for transmission, reception, access control and signalling,
and telephone and teleprinter equipment. Optional equipment for low\(hyspeed
data, high\(hyspeed data, facsimile,\ etc., can be installed with the below\(hydeck
.LP
equipment. Before joining the Network, SESs have to successfully complete
the prescribed commissioning tests.
.PP
1.1.4
The
space segment
consists of three operational
satellites, one in each ocean region, together with three spare satellites
provided on a 1\(hyfor\(hy1 basis. The operational satellites are in a
geostationary orbit and provide global coverage up to\ 75\(de latitude.
.PP
1.2
The satellite channels needed to establish communication services and associated
signalling in the Standard\ A system are described below:
.sp 1P
.LP
1.2.1
    \fICommon TDM carrier\fR
.sp 9p
.RT
.PP
The common TDM carrier (or common signalling channel) is
transmitted by the NCS and is received by all CESs amd SESs in the respective
ocean region for the reception of signalling messages from the NCS.
.RT
.sp 1P
.LP
1.2.2
    \fICoast earth station TDM carrier\fR
.sp 9p
.RT
.PP
Each coast earth station transmits a TDM carrier at a frequency
which is uniquely associated with the station. The TDM carrier carries
signalling messages to the NCS and telegraph channels to ship earth stations.
Twenty\(hytwo 50\(hybaud telex channels and an out\(hyof\(hyband signalling
channel are
time\(hydivision multiplexed on the TDM carrier in the shore\(hyto\(hyship
link.
.bp
.RT
.sp 1P
.LP
1.2.3
    \fIShip earth station TDMA channel\fR
.sp 9p
.RT
.PP
There is a ship\(hyto\(hyshore TDMA channel, paired to the CES TDM
carrier, for the corresponding ship\(hyto\(hyshore twenty\(hytwo 50\(hybaud
channels. SESs transmit their telex channels in bursts in this channel,
with burst timing
derived from the \*Qunique word\*U in the CES TDM carrier.
.RT
.sp 1P
.LP
1.2.4
    \fIRequest channels\fR
.sp 9p
.RT
.PP
Request messages are transmitted by ship earth stations as random access
bursts. Each coast earth station monitors the two ship\(hyto\(hyshore channels
and processes only those call requests addressed to it.
.RT
.sp 1P
.LP
1.2.5
    \fIFM/SCPC channels\fR
.sp 9p
.RT
.PP
Frequency modulated single channel per carrier channels are used
for the transmission of voice, data and analog and digital facsimile. Telephone
channels are assigned on demand by the network coordination station.
.RT
.sp 1P
.LP
1.2.6
    \fIHigh Speed Data (HSD)\fR \fIchannels\fR
.sp 9p
.RT
.PP
High\(hyspeed 56 kbit/s data transmission is also possible, but in the
ship\(hyto\(hyshore direction only, from specially equipped SESs to specially
equipped CESs.
.RT
.PP
1.3
The following services are provided by each CES:
.sp 9p
.RT
.LP
    a)
    telephone calls on a ship\(hyto\(hyshore, shore\(hyto\(hyship and
ship\(hyto\(hyship basis; the channels may be used for facsimile or
data at the user's discretion;
.LP
    b)
    telex calls on a ship\(hyto\(hyshore, shore\(hyto\(hyship and
ship\(hyto\(hyship basis;
.LP
    c)
     optional services which may be provided at the discretion of the respective
CES operator:
.LP
    i)
    group calls, i.e., calls to groups of SESs, using only a
shore\(hyto\(hyship channel (telephony or telegraphy). The SESs in the
group may be selected on the basis of:
.LP
    \(em
    national identity,
.LP
    \(em
    fleet,
.LP
    \(em
    ocean area,
.LP
    \(em
    similar interest;
.LP
    ii)
    high\(hyspeed data 56 kbit/s ship\(hyto\(hyshore direction only.
.sp 2P
.LP
\fB2\fR     \fBStandard B system\fR
.sp 1P
.RT
.PP
2.1
The Standard B system has been designed to provide more
efficient utilisation of satellite power and bandwidth resources for INMARSAT's
.sp 9p
.RT
.LP
mainstream services (telephone and telex), to provide digital data services,
and to provide the capability of fulfilling future maritime ISDN service
requirements.
.PP
2.2
The Standard B system consists of the following major elements in an ocean
region, in addition to the satellites:
.LP
    a)
    the network coordination station (NCS);
.LP
    b)
    coast earth stations (CESs); and
.LP
    c)
    ship earth stations (SESs).
.PP
2.2.1
Three network coordination stations are provided in the
Standard
B system, one in each region, managing central resources such as SCPC traffic
channels when demand assigned operation is used, and coordinating signalling
and control traffic.
.bp
.sp 9p
.RT
.PP
2.2.2
Each coast earth station provides the interface between the
terrestrial network and the mobile ship earth stations within the coverage
area of the satellite. Coast earth stations operate at C\(hyband (although
an L\(hyband
capability is also required for NCS signalling purposes). The terrestrial
network interfaces provided at CESs are at the discretion of each CES
operator.
.PP
2.2.3
The mobile ship earth station interfaces with the CES via the
space segment at L\(hyband; multi\(hychannel ship earth stations are planned
as an
addition to the baseline system.
.PP
2.3
SESs wishing to operate in a particular ocean region do not
have to register with a particular CES on a
log\(hyon/log\(hyoff basis
once they have met the requirements of the commissioning tests. All relevant
SES and service information is provided to the CES during initialisation
signalling
procedures.
.sp 9p
.RT
.PP
2.4
The satellite channels used for communication services and
signalling in the Standard\ B system are described below:
.PP
2.4.1
\fIVoice (V) channels\fR  | are single\(hychannel\(hyper\(hycarrier (SCPC)
digital channels supporting a voice coding rate of 16\ kbit/s with
Adaptive Predictive Coding (APC)
. These channels also support voice band data
(including facsimile) up to 2400\ kbit/s information rate, and sub\(hyband
signalling (for service address and, in the future, ISDN signalling).
.PP
2.4.2
The \fIData (D) channel\fR  | is an SCPC digital channel supporting a
data information rate of 9.6\ kbit/s. These channels also support Group\ 3
facsimile and sub\(hyband signalling.
.PP
2.4.3
\fICES TDM channel\fR  | are used to carry CES signalling messages to
SESs, including channel assignments, telex (ITA2) and data (IA5 asynchronous)
at 300\ bit/s information rate.
.PP
2.4.4
\fINCS TDM channels\fR  | are used to carry NCS signalling messages to
SESs and CESs including call announcements and channel assignments and
Bulletin Board information so that additional or alternate signalling channels
can be
implemented to meet operational needs.
.PP
2.4.5
\fISES TDMA channels\fR  | are used to carry SES telex (ITA2) or data
(IA5) at 300\ bit/s information rate.
.PP
2.4.6
\fISES Request channel (SESRQ)\fR  | is a random access (Aloha) channel
used to carry SES signalling information, specifically the request signals
which initiate a ship\(hyoriginated call transaction to CESs (including
satellite spot\(hybeam identification).
.PP
2.4.7
\fISES Response channel (SESRP)\fR  | provides SES signalling
information to CESs, specifically the SES response information required to
facilitate a shore\(hyoriginated call (including satellite spot\(hybeam
identification).
.PP
2.4.8
\fICES/NCS Inter\(hyStation Signalling channel (ISS)\fR  | enables
signalling information to be exchanged between CESs and NCSs for call and
network management purposes.
.PP
2.5
The following services are available at each CES:
.sp 9p
.RT
.LP
    a)
    telephone calls on a ship\(hyto\(hyshore, shore\(hyto\(hyship and
ship\(hyto\(hyship basis;
.LP
    b)
    telex calls on a ship\(hyto\(hyshore, shore\(hyto\(hyship and
ship\(hyto\(hyship basis;
.LP
    c)
    broadcast of shore originated telephone or telex calls when
addressed with any of the following:
.LP
    \(em
    the SES's unique mobile ship earth staion number,
.LP
    \(em
    an \*Qall ships\*U identity,
.bp
.LP
    \(em
    a national identity,
.LP
    \(em
    a fleet group identity,
.LP
    \(em
    a general group identity;
.LP
    d)
    voice band data services, including facsimile;
.LP
    e)
    digital data services, including Group 3 facsimile.
.PP
2.6
Further services determined in the future for ISDN applications will be
added as a feature of this system once they have been clearly defined.
.sp 9p
.RT
.sp 2P
.LP
\fB3\fR     \fBStandard C system\fR
.sp 1P
.RT
.PP
3.1
The Standard C communications system has been designed allowing the operation
of the smallest ship earth station in the INMARSAT system and
thus enabling the smallest vessels to avail themselves with satellite
communications. Its primary communications function is text and data
transmission to and from ships. It has been designed to interface with the
International Telex Network on a store\(hyand\(hyforward basis as well
as a range of terrestrial data networks. It is also able to carry an oceanwide
broadcast only service known as the Enhanced Call group (EGC).
.sp 9p
.RT
.PP
3.2
The Standard C system consists of the following main elements in an ocean
region:
.LP
    a)
    the network coordination station (NCS);
.LP
    b)
    coast earth station (CES); and
.LP
    c)
    ship earth station (SES).
.PP
3.2.1
Three network coordination stations are initially provided in the Standard\
C system, one in each ocean region, managing central resources
such as traffic channels and coordinating signalling and control traffic.
.sp 9p
.RT
.PP
3.2.2
Each coast earth station serves as a gateway to and from the
terrestrial network to ship earth stations within the coverage area of the
satellite. The types of terrestrial network interfaces at a coast earth
station are a national matter.
.PP
3.2.3
The ship earth station consists of a DTE which provides the user interface
and a DCE which provides the interface to the satellite network. In the
ship\(hyto\(hyshore direction, a message is formatted in the DTE and then
transferred to the DCE for transmission. In the shore\(hyto\(hyship direction,
the
DCE receives the complete message from the radio channel before passing
it to the DTE. The mobile ship earth station may be equipped for access
to marine
safety information carried by the enhanced group call service, or a separate
receive\(hyonly terminal for EGC calls may be used. Using the
distress
priority message
, a ship operator may transmit a ship\(hyto\(hyshore distress
alert. Upon receipt of this message, the addressed coast earth station will
.LP
immediately provide confirmation of the message being received. This
distress alert message
provides the ability to include the position of the vessel. A ship earth
station wishing to operate in a particular ocean
region must log in to the NCS in that region.
.PP
3.3
The Standard C system consists of 5 main channel types which are described
below.
.PP
3.3.1
The \fINCS common channel\fR  | is transmitted continuously by the NCS.
All mobile ship earth stations registered as operational in a particular
ocean region must tune to this channel when not engaged in message transfer.
This
channel provides the following functions: message announcements, message
confirmations, frequency reference for all ship earth stations and EGC
message transmission.
.PP
3.3.2
\fINCS\(hyCES signalling links\fR  | pass information between the NCS and
CESs concerning the operational status of the network. This link is used
to
transfer EGC messages from a CES to the NCS for subsequent transmission
on the NCS common channel. It also relays signalling information to ship
earth
stations and CESs.
.PP
3.3.3
\fIMessage channels\fR  | are used by SESs to transfer their message
traffic to a CES. The message channel is assigned by the CES.
.bp
.PP
3.3.4
\fISignalling channels\fR  | are used by SESs to transmit signalling
information to a CES. Each CES has one or more of these channels assigned to
it.
.PP
3.3.5
The \fINCS\(hyNCS signalling channel\fR  | is an inter\(hyocean\(hyregion data
connection between the three NCSs. This link is used for updating SES log\(hyin
status.
.PP
3.4
The following services are provided on a mandatory basis by
each CES:
.sp 9p
.RT
.LP
    a)
    store\(hyand\(hyforward telex;
.LP
    b)
    Enhanced Group Call message handling and distress message
handling.
.sp 2P
.LP
\fB4\fR     \fBAeronautical system (Initial system)\fR
.sp 1P
.RT
.PP
4.1
The INMARSAT aeronautical satellite communications system will provide
two\(hyway voice and data communications for aircraft operating within
the coverage area of a set of geostationary satellites. Since the system
capabilities will evolve with time, the initial set of capabilities and
functions are designated \*QInitial system\*U. The additional capabilities and
functions which may be added due to traffic demand and technological evolution
will form the \*QEnhanced system\*U.
.sp 9p
.RT
.PP
4.2
The Aeronautical system consists of the following major elements in an
ocean region:
.LP
    a)
    the network coordination station (NCS);
.LP
    b)
    the aeronautical ground earth station (GES); and
.LP
    c)
    the mobile aircraft earth station (AES).
.PP
4.2.1
Network coordination stations will be provided as part of the \*QEnhanced
system\*U to manage central resources such as allocating traffic
channels on a demand assigned basis. Due to the limited number of GESs
involved in the initial aeronautical system the provision of NCS facilities
has not
been considered necessary.
.sp 9p
.RT
.PP
4.2.2
Aeronautical ground earth stations
interface to and from the terrestrial network to mobile aircraft earth
stations within the coverage area of a specific satellite. The types of
terrestrial network interfaces at
the GES are provided at the discretion of the GES operator.
.PP
4.2.3
The
mobile aircraft earth station
(AES) interfaces with
the space segment at L\(hyband, and interfaces within the aircraft with the
Aircraft Communications Addressing and Report System (ACARS) and other data
equipment and with aircraft crew and passenger voice equipment.
.PP
4.3
An AES wishing to operate in a particular ocean region must
register with a GES in the Initial system. The procedure known as the
log\(hyon/log\(hyoff of an AES provides the GES with the ability to manage
the number of AESs receiving one forward P\(hyChannel (Pd) and transmitting
on each R\(hyChannel (Rd), thus controlling the queueing delays and burst
collision probabilities. Provision exists in the Initial system for the
log\(hyon handover of a
particular AES to another GES which may work to a different satellite ocean
region. The handover can be initiated on an automatic or manual basis depending
on the type of AES and the specific requirements of the aircraft at that
time.
.PP
4.4
The aeronautical Initial system is configured with the following main channel
types:
.sp 1P
.LP
4.4.1
    \fIP\(hychannel (ground earth station\(hymobile aircraft earth station)\fR
.sp 9p
.RT
.PP
The P\(hychannel is a TDM channel which is used to provide system
management and medium speed data services in the ground\(hyto\(hyair direction.
Once the AES has logged on, it is directed to tune to this P\(hychannel
over which both system management information and other data can be passed.
In the Initial
system, the communication links between GESs in the same ocean area will
be by means of P\ channels.
.RT
.sp 1P
.LP
4.4.2
    \fIR\(hychannels (mobile aircraft earth station\(hyground earth station)\fR
.sp 9p
.RT
.PP
The R\(hychannels are a set of randpm access channels which are used for
log\(hyon, system management and some short user messages.
.bp
.RT
.sp 1P
.LP
4.4.3
    \fIT\(hychannels (mobile aircraft earth station\(hyground earth station)\fR
.sp 9p
.RT
.PP
The T\(hychannel which is a TDMA channel is used to pass longer
messages from the aircraft.
.RT
.sp 1P
.LP
4.4.4
    \fIC\(hychannel (ground earth station\(hymobile aircraft earth station)\fR
.sp 9p
.RT
.PP
The C\(hychannels are established and cleared by circuit switching
signalling procedures, to provide voice traffic capabilities between the GES
and AESs. The channel format allocates the bulk of the channel capacity for
circuit switched voice or data service, and also provides a low\(hyrate
\*Qsub\(hyband\*U channel for signalling and some data.
.RT
.sp 1P
.LP
4.4.5
    \fINCS\(hyGES links\fR
.sp 9p
.RT
.PP
Plans to provide NCSs under the Enhanced system will require the
provision of NCS\(hyGES channels which will be based on the P\(hychannels
used for
inter\(hyGES communications in the Initial system.
.RT
.PP
4.5
The four main application areas for the Aeronautical
system are:
.sp 9p
.RT
.LP
    i)
    air traffic services;
.LP
    ii)
    aeronautical operations control;
.LP
    iii)
    aeronautical administrative communications;
.LP
    iv)
    aeronautical passenger communications.
.PP
The availability of a particular service in a given area will be dependent
upon the facilities offered by the respective GESs.
.PP
4.5.1
Voice services in the Initial system will be primarily in the
air\(hyto\(hyground direction and will enable passengers and air crew to set up
telephone calls through GESs which offer the telephony service.
.PP
4.5.2
For data, connection mode and connectionless mode, open systems
interconnection (OSI) network layer services will be provided, based on a
connectionless link layer protocol. Circuit mode data service may be provided
as an option.
.PP
4.5.3
Telex service will be available as an option in the aeronautical   system.
.LP
.rs
.sp 21P
.ad r
BLANC
.ad b
.RT
.LP
.bp
.LP
\fBMONTAGE:\fR PAGE 362 = PAGE BLANCHE
.sp 1P
.RT
.LP
.bp