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Recommendation I.251 - Number identification supplementary services
The purpose of this Recommendation is to provide the stage 1 description of the method defined in Recommen-
dation I.130 using the means given in Recommendation I.210.
Supplementary services are described by a prose definition and description (step 1.1) and by a dynamic
description (step 1.3). The application of the attribute technique, as defined in RecommendationI.140, for sup-
plementary services is for further study.
This Recommendation describes the following Number Identification Supplementary Services:
I.251.1 - Direct Dialling In (DDI)
I.251.2 - Multiple Subscriber Number (MSN)
I.251.3 - Calling Line Identification Presentation (CLIP)
I.251.4 - Calling Line Identification Restriction (CLIR)
I.251.5 - Connected Line Identification Presentation (COLP)
I.251.6 - Connected Line Identification Restriction (COLR)
I.251.7 - Malicious Call Identification (MCI) (Note1)
I.251.8 - Sub-addressing (SUB) (Note 1)
Note 1 - These services being identified need to be further studied and the descriptions are not yet included.
I.251.1 Direct Dialling In
1. Definition
Direct Dialling In (DDI) enables a user to directly call another user on a ISPBX or other private system without
attendant intervention.
2. Description
2.1 General description
A part of the ISDN number, which is significant to the called user, is passed to that user during call establishment. This
supplementary service is based on the use of the ISDN number and does not include sub-addressing.
Note 1 - A similar method to select a terminal on a passive bus is described in the supplementary service MSN.
Note 2 - The caller may or may not find the ISDN number in the public directory.
2.2 Specific terminology
None.
2.3 Qualifications on the applicability to telecommunications services
No restrictions.
3. Procedures
3.1 Provision/withdrawal
This service shall be provided/withdrawn after pre-arrangement with the service provider. The service provider shall
allocate a set of ISDN numbers.
3.2 Normal procedures
3.2.1 Activation/deactivation/registration
Activation through subscription.
3.2.2 Invocation and operation
Call initiation procedures are the same as for the basic service. The calling and called users perceive the same com-
pletion procedures as for the basic service, without attendant intervention. Upon answer, the calling user is connected to
the called user designated by the ISDN number.
Note - When the connection from the caller to the ISPBX is established, the called ISPBX might use the connection for call
progress signalling transmission.
3.3 Exceptional procedures
3.3.1 Activation/deactivation/registration
Not applicable.
3.3.2 Invocation and operation
If the called user is busy or does not answer, the procedures for basic calls will apply.
If a call is made by sending incomplete address information, the call will be released by time supervision within the
public exchange. A corresponding time supervision within the ISPBX may also be convenient.
3.4 Alternate procedures
3.4.1 Activation/deactivation/registration
Not identified.
3.4.2 Invocation and operation
Not identified.
4. Network capabilities for charging
This Recommendation does not cover charging principles. Future Recommendations in the D-Series are expected to
contain that information. It shall be possible to charge the subscriber accurately for the service. For example, supplemen-
tary service provision may be part of the general subscription charges. Charges may include a subscription fee and a
rental charge proportional to the quantity of numbers assigned.
5. Interworking requirements
No problems identified.
6. Interaction with other supplementary services
6.1 Call Waiting
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.2 Call Transfer
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.3 Connected Line Identification Presentation
For further study.
6.4 Connected Line Identification Restriction
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.5 Calling Line Identification Presentation
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.6 Calling Line Identification Restriction
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.7 Closed User Group
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.8 Conference Calling
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.9 Direct Dialling In
Not applicable.
6.10 Diversion services
6.10.1 Call Forwarding Busy
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.10.2 Call Forwarding No Reply
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.10.3 Call Forwarding Unconditional
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.11 Line Hunting
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.12 Three-Party Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.13 User-to-User Signalling
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.14 Multiple Subscriber Number
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.15 Call Hold Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.16 Advice of Charge
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
7. Dynamic description
The dynamic description is as for basic services.
I.251.2 Multiple Subscriber Number
1. Definition
Multiple Subscriber Number (MSN) provides the possibility for assigning multiple ISDN numbers to a single interface.
This allows e.g.
1) to dial from a line connected to a public network directly to terminals connected to a basic access which has
subscribed to MSN (e.g. in a passive bus configuration);
2) the network to determine which ISDN number is applicable on originating calls, e.g. for charging purposes, for
notification to the called party and application for supplementary services.
It is considered:
- that some administrations may not have knowledge or control over what is connected to the basic access, e.g.
an NT2 or passive bus;
- that administrations have differing numbering methods;
- that common international terminal specifications are desired.
2. Description
2.1 General description
The addressing of terminals on a basic access may be achieved by applying a set of ISDN numbers to the single basic
access. When a call with one of these ISDN numbers is delivered, the called number is indicated to the MSN user, either
directly or through a mapping by the network.
In general, any set of numbers may be sent from the network to the subscriber's equipment during call establishment.
However, it is recognized that administrative practices and certain equipment designs may lead to the adoption of
restricted numbering sequences, e.g. by relating the last digit(s) of a fixed length ISDN number to the terminals to be
connected. The actual method of relating the ISDN number to a particular terminal is a matter of national implementation
but may, for example, be done by central intelligence or by distributed intelligence within the terminals.
The essential difference between this supplementary service and DDI concerns the length of the number sent to and
processed by the user's installation. In the DDI situation the user (ISPBX) will be tailored on a per installation basis to
receive the particular number of digits necessary to identify the terminals of this user (ISPBX).
With the multiple subscriber number supplementary service however, the service provider will fix the length of the num-
ber to be transmitted to the user's installation. It may comprise 1 or 2 or 3 of the last digits up to the full ISDN number.
This number will be sent to the user network interface.
The digit(s) significant for terminal differentiation is/are an integral part of the ISDN numbering scheme.
Note - MSN is independent from and does not impose any constraints on "service indication" and "sub-addressing".
2.2 Specific terminology
None.
2.3 Qualifications on the applicability to telecommunications services
No restrictions.
3. Procedures
3.1 Provision/withdrawal
The service shall be provided after pre-arrangement with the service provider.
The service provider shall allocate a set of ISDN numbers (not necessarily consecutive). At the option of the service
provider, one of these numbers may be designated by the MSN subscriber as the default number for the interface. At the
option of the service provider, the user may specify a mapping arrangement between ISDN number and MSN digit(s).
3.2 Normal procedures
3.2.1 Activation/deactivation/registration
Activation through subscription.
3.2.2 Invocation and operation
The destination number sent by the calling user will be analyzed in the network. If the called user subscribes to this
supplementary service, the network sends the available part of the ISDN number or at least the relating digit(s)
i) identical to that last digit(s) of the ISDN number; or
ii) generated by the network on the basis of a mapping process between ISDN number(s) and MSN digit(s).
Terminals compatible to the MSN service will react on a call as follows:
- if MSN digit(s) equal to their own preadjusted identity is (are) presented, they react to it in a predetermined
way;
- if there is a setup message without MSN digit(s), the terminal will interpret it as a normal call. (This may hap-
pen if a terminal with MSN capabilities is used on an interface, where MSN is not subscribed for.)
Terminals not compatible to the MSN service will react on a call as follows:
- either if there is (are) MSN digit(s) or not, the call will be interpreted as a normal call.
On outgoing calls a terminal compatible with the MSN service may provide the ISDN number (or MSN digits) when plac-
ing the call. The network will carry this identity unchanged or will replace the digit(s) by the associated ISDN number. The
ISDN number of the calling terminal will then be sent to the called user with the incoming call (refer to CLIP supplementary
service).
It is possible to allocate one ISDN number to one or more terminals. Similarly, one terminal may allow the assignment
of one or more than one number. Further, as an administrative option a specific digit or sequence of digits may be allo-
cated to enable all terminals in a point-to-multipoint configuration to react in the same way as if the supplementary ser-
vice MSN would not be subscribed to.
3.3 Exceptional procedures
3.3.1 Activation/deactivation/registration
Not applicable.
3.3.2 Invocation and operation
An ISDN number or MSN digits, generated by a terminal at an interface where MSN is in operation shall be discarded
by the network unless this number is subscribed to by this interface. A default number may be provided by the network.
3.4 Alternative procedures
3.4.1 Activation/deactivation/registration
None identified.
3.4.2 Invocation and operation
None identified.
4. Network capabilities for charging
This Recommendation does not cover charging principles. Future Recommendations in the D-Series are expected to
contain that information. It shall be possible to charge the subscriber accurately for the service.
5. Interworking requirements
None identified.
6. Interaction with other supplementary services
In case of interaction with other supplementary services, these services could be applicable to the individual MSN rather
than to the subscriber access.
6.1 Call Waiting
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.2 Call Transfer
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.3 Connected Line Identification Presentation
See COLP (I.251.5) interaction with MSN.
6.4 Connected Line Identification Restriction
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.5 Calling Line Identification Presentation
Upon call initiation, if the ISDN number indicated by the MSN user terminal is not subscribed to for the interface, or if
no numbering information is indicated, a default number (if designated by the MSN subscriber) or a number unavailable
indication is provided to the CLIP user.
6.6 Calling Line Identification Restriction
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.7 Closed User Group
For further study.
6.8 Conference Calling
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.9 Direct Dialling In
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.10 Diversion services
6.10.1 Call Forwarding Busy
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.10.2 Call Forwarding No Reply
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.10.3 Call Forwarding Unconditional
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.11 Line Hunting
For further study.
6.12 Three-Party Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.13 User-to-User Signalling
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.14 Multiple Subscriber Number
Not applicable.
6.15 Call Hold Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.16 Advice of Charge
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
7. Dynamic description
The dynamic description is as for the basic services.
I.251.3 Calling Line Identification Presentation
1. Definition
Calling Line Identification Presentation (CLIP) is a supplementary service offered to the called party which provides the
calling party's ISDN- number, possibly with sub-address information, to the called party.
2. Description
2.1 General description
When CLIP is applicable and activated, the network provides the calledparty with the number of the calling party at call
set-up on all incoming calls.
The calling party number may be accompanied by a sub-address.
The network should be capable of transmitting at least 15 digits (maximum length of an ISDN number). In addition, if
provided by the calling party, the network should be capable of transmitting a sub-address.
The network to which the calling party belongs should attempt to ensure that enough digits are transmitted to enable
the called party to return the call, based on the calling number presented.
2.2 Specific terminology
None identified.
2.3 Qualifications on the applicability to telecommunication services
This supplementary service is applicable to all telecommunication services.
It is to be noted that in the Telematic services an exchange of Terminal Identification (TID) occurs at a higher layer
subsequent to a successful call establishment.
For Telematic services this supplementary service shall consist only of the access number of the calling party and this
shall be provided by the network. For other non-voice services this supplementary service is for further study. The presen-
tation of the calling party's ISDN-number by Telematic terminals and by other non-voice terminals is for further study.
3. Procedures
3.1 Provision/withdrawal
CLIP may be provided on a subscription basis or be generally available. CLIP may be withdrawn at the request of the
subscriber or by the network provider for administration reasons.
3.2 Normal procedures
3.2.1 Activation/deactivation/registration
CLIP is activated on provision and deactivated on withdrawal. No information needs to be registered with the network
for this supplementary service.
3.2.2 Invocation and operation
The number presented shall unambiguously identify the access of the calling party. The number presented is either:
i) completely provided by the network;
ii) completely provided by the calling party; or
iii) partially provided by the network with the rest provided by the calling party, e.g., the access number is provided
by the network and the additional digits to make the number complete by the calling party.
Where either the complete calling number, or part of the calling number is initially provided by the calling party, the
network shall check its validity. If this check is successful, then this number is used by the network. For complete calling
numbers, this validity check shall determine whether the number is allocated to the access; for partially provided numbers
this check shall for example, determine whether the digits are within the allocated range.
3.3 Exceptional procedures
3.3.1 Activation/deactivation/registration
None identified.
3.3.2 Invocation and operation
If the network check on a calling party provided number is unsuccessful, the network will use the default number as the
number of the calling party.
There are two exceptions when the calling party number is not presented to the called party:
i) when the calling party has an arrangement (see definition of Calling Line Identification Restriction) that presen-
tation of his number is not allowed; and
ii) when the calling party number is not available, e.g., due to interworking with the analogue telephone network
(PSTN).
In such cases no number is presented to the called party, but he shall receive an indication that the number of the
calling party is unavailable.
3.4 Alternative procedures
3.4.1 Activation/deactivation/registration
None identified.
3.4.2 Invocation and operation
In some cases where a calling party has an arrangement that presentation of his number is not allowed, there may be
certain categories of called party that have the ability to override this restriction and have the calling number presented.
This function is a national option.
Problems may occur when the calling party does not belong to the same network as the called party and in the calling
party's network the override category does not exist, but in the called party's network this category does exist. A problem
occurs when a calling party who restricts presentation and assumes that his number is never presented, makes a call to a
called party who has the override category.
The cases where the override category is applied is a national matter. Depending on bilateral agreement about the
application of the override category in country B, and the presentation not allowed arrangement of the calling party in
country A, country A may or may not deliver the calling line identification to country B. Agreements are also needed with
any transit network.
4. Network capabilities for charging
This Recommendation does not cover charging principles. Future Recommendations in the D-Series are expected to
contain that information. It shall be possible to charge the subscriber accurately for the service.
5. Interworking requirements
On calls incoming from some non-ISDN networks, the calling number may be delivered to the destination ISDN without
the ability to indicate whether presentation is allowed or not. How the ISDN should behave in this case is for further study.
From some other non-ISDN networks, no calling party number may be available to the ISDN and therefore the full
number of the calling party cannot be given to the called party who has been provided with CLIP. In this situation a partial
number, or a number unavailable indication, is given to the called party.
As a national option, the originating network shall have the possibility to restrict any information identifying the calling
party from being forwarded to another network. If a destination network receives a calling party ISDN number without any
indication of presentation allowed or restricted, the destination network (host network) will act according to its own rules
and regulations.
6. Interaction with other supplementary services
6.1 Call Waiting
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
If an ISDN User(s) who has subscribed to the Call Waiting service at his B access, has been given a call waiting indi-
cation and has subscribed to the CLIP service, then the calling party's number shall be presented to the ISDN User(s) at B
at the time the call waiting indication is given. The presentation of the CLIP information shall be the same as when the
ISDN User(s) at B receives a normal call.
6.2 Call Transfer
See text in _6.5, CLIP, in the Call Transfer supplementary service definition.
6.3 Connected Line Identification Presentation
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.4 Connected Line Identification Restriction
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.5 Calling Line Identification Presentation
Not relevant.
6.6 Calling Line Identification Restriction
The calling line identification will not be presented if the calling user has an arrangement to inhibit the presentation of
his number to the called party. The only occasion when a user subscribing to CLIP can take precedence over CLIR is when
the user has an override category. This is a national option.
6.7 Closed User Group
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.8 Conference Calling
Any party that has subscribed to CLIP will receive the number of a calling conference controller when:
- the party is to be included as a "New Party" during the invocation of a conference call; or
- the party is being added to an existing conference call.
6.9 Direct Dialling In
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.10 Diversion services
If an incoming call to the party to which CLIP has been provided has already been forwarded, then the calling party's
number should be the number of the original calling party.
6.10.1 Call Forwarding Busy
See text in Call Forwarding Busy for further information.
6.10.2 Call Forwarding No Reply
See text in Call Forwarding No Reply for further information.
6.10.3 Call Forwarding Unconditional
See text in Call Forwarding Unconditional for further information.
6.11 Line Hunting
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
The Line Hunting service occurs before CLIP. The Line Hunting service would first provide a selection of an interface for
presentation of a call. Once the service selects an interface, normal call processing would occur including the presentation
of the calling party's number to a selected interface who has subscribed to CLIP.
6.12 Three-Party Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.13 User-to-User Signalling
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.14 Multiple Subscriber Number
See text in Multiple Subscriber Number definition.
6.15 Call Hold Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.16 Advice of Charge
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
7. Dynamic description
The dynamic description for this service is shown in Figure1/I.251.3.
I.251.4 Calling Line Identification Restriction
1. Definition
Calling Line Identification Restriction (CLIR) is a supplementary service offered to the calling party to restrict presenta-
tion of the calling party's ISDN-number and Sub-Address to the called party.
2. Description
2.1 General description
When CLIR is applicable and activated the originating node provides the destination node with a notification that the
calling party's ISDN number and any Sub-Address information, is not allowed to be presented to the called party. In this
case no calling party number is included in the call offering to the called party's installation.
Note - When CLIR is subscribed to, some Network Providers may not wish to send the originating identity of the calling
customer to other Network Providers.
2.2 Specific terminology
None identified.
2.3 Qualifications on the applicability to telecommunications services
None identified, i.e., this supplementary service is applicable to all telecommunication services.
3. Procedures
3.1 Provision/withdrawal
CLIR can be provided on a subscription basis or be generally available.
As a network provider option, CLIR can be offered with several subscription options. The options apply separately to
each ISDN number. Subscription options are summarized below:
Subscription Option Values
CLIR mode - permanent (active for all calls)
- temporary (specified by user per call)
Default (only for temporary mode) - presentation restricted
- presentation not restricted
It is a network provider option to specify either or both of the above options for all subscribers, for instance, in an
exchange or network.
3.2 Normal procedures
3.2.1 Activation/deactivation/registration
If subscribed to in the permanent mode, CLIR is always activated. If subscribed to on a temporary basis, CLIR is acti-
vated upon explicit request for the service, or on default, on a particular call and is deactivated after that call.
3.2.2 Invocation and operation
If the called party subscribes to Calling Line Identification Presentation and the calling party has CLIR activated, the
called party shall receive an indication that the calling party number is not available.
3.3 Exceptional procedures
3.3.1 Activation/deactivation/registration
No exceptional procedures identified.
3.3.2 Invocation and operation
No exceptional procedures identified.
3.4 Alternative procedures
3.4.1 Activation/deactivation/registration
No alternative procedures identified.
3.4.2 Invocation and operation
Certain countries may define categories of subscribers that have the ability to override the presentation restriction and
have the calling party's ISDNnumber and any Sub-Address presented (e.g., the police).
The ability to have such override category is a national option.
When a call originates in one ISDN and terminates in another ISDN and CLIR is applied, the rules and regulations of the
destination network (the host network) should apply. For example, if override category is not applicable in the originating
network but in the destination network a call with CLIR applied can still be overridden in the destination network, whenever
information on the calling line is available for this network.
4. Network capabilities for charging
This Recommendation does not cover charging principles. Future Recommendations in the D-Series are expected to
contain that information. It shall be possible to charge the subscriber accurately for the service.
5. Interworking requirements
On calls to or via non-ISDNs, it cannot be assured that a CLIR indication can be carried to the destination network. As
a national option the originating network shall have the possibility to restrict any information identifying the calling party
from being forwarded to the destination network when CLIR is applicable. If a network receives a calling party ISDN number
without any indication of presentation allowed or restricted, the destination network (the host network) will act according to
its rules and regulations.
6. Interaction with other supplementary services
6.1 Call Waiting
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
Assume that a call from a User at C, who has subscribed to the CLIR service, invokes Call Waiting at a User(s) at B.
The User(s) at B would receive a call waiting indication but would not receive the calling User at C's number when the call
waiting indication is given.
6.2 Call Transfer
Assume that a User A has an established call with User B and wishes to transfer this call with User B to User C. If User
A has subscribed to CLIR, then User C shall not receive a calling number when User A invokes any call transfer procedure.
If User B has subscribed to CLIR, then User C shall not receive a calling number during the transfer of User B to User C.
6.3 Connected Line Identification Presentation
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.4 Connected Line Identification Restriction
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.5 Calling Line Identification Presentation
CLIR will take precedence over Calling Line Identification Presentation (CLIP).
The only occasion when a user subscribing to CLIP can take precedence over CLIR is when the user has an override
category. This is a national option.
6.6 Calling Line Identification Restriction
Not relevant.
6.7 Closed User Group
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.8 Conference Call
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.9 Direct Dialling In
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.10 Diversion services
6.10.1 Call Forwarding Busy
When CLIR is applicable and activated, the calling party's ISDN-number will not be presented to the "forwarded-to"
user unless this user has an override category. The latter is a national option.
6.10.2 Call Forwarding No Reply
When CLIR is applicable and activated, the calling party's ISDN-number will not be presented to the "forwarded-to"
user unless this user has an override category. The latter is a national option.
6.10.3 Call Forwarding Unconditional
When CLIR is applicable and activated, the calling party's ISDN-number will not be presented to the "forwarded-to"
user unless this user has an override category. The latter is a national option.
6.11 Line Hunting
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.12 Three-Party Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.13 User-to-User Signalling
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.14 Multiple Subscriber Number
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.15 Call Hold Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.16 Advice of Charge
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
7. Dynamic description
The dynamic description for this service is shown in Figure1/I.251.4.
I.251.5 Connected Line Identification Presentation
1. Definition
Connected Line Identification Presentation (COLP) is a supplementary service offered to the calling party which provides
the connected party's ISDN- number to the calling party.
2. Description
2.1 General description
When COLP is applicable and activated, the network provides the calling party with the number of the connected party
when the connected party answers the incoming call. The network should be capable of transmitting at least 15 digits
(maximum length of an ISDN number).
Note - The possibility of enhancing this service to provide the called party number before the called party answers the call
is for further study.
2.2 Specific terminology
None identified.
2.3 Qualifications on the applicability to telecommunication services
This supplementary service is applicable to all telecommunication services.
It is to be noted that in the Telematic services an exchange of Terminal Identification (TID) occurs at a higher layer
subsequent to a successful call establishment.
For Telematic services this supplementary service shall consist only of the access number of the connected party and
this shall be provided by the network. For other non-voice services this supplementary service is for further study. The
presentation of the connected party's ISDN number by Telematic terminals and by other non-voice terminals is for further
study.
3. Procedures
3.1 Provision/withdrawal
The COLP supplementary service may be provided on a subscription basis or be generally available.
COLP may be withdrawn at the request of the subscriber or by the network provider for administration reasons.
3.2 Normal procedures
3.2.1 Activation/deactivation/registration
COLP is activated on provision and deactivated on withdrawal.
No information needs to be registered with the network for this supplementary service.
3.2.2 Invocation and operation
The number presented shall unambiguously identify the access of the connected party. The number presented is either:
i) completely provided by the network;
ii) completely provided by the connected party; or
iii) partially provided by the network with the rest provided by the connected party, e.g., the access number is
provided by the network and the additional digits to make the number complete by the connected party.
Where either the complete connected number, or part of the connected number is initially provided by the connected
party the network shall check its validity. If this check is successful then this number is used by the network.
3.3 Exceptional procedures
3.3.1 Activation/deactivation/registration
None identified.
3.3.2 Invocation and operation
3.3.2.1 There are two exceptions when the connected party number is notpresented to the calling party:
i) when the connected party has (see definition of Connected Line Identification Restriction) an arrangement that
presentation of his number is not allowed; or
ii) when the connected party number is not available, e.g., due to interworking with the (analogue) Public Switched
Telephone Network (PSTN).
In such cases the calling party shall be given a number unavailable indication.
If the network check on the connected party provided number is unsuccessful, the network default number will be used
instead.
3.4 Alternative procedures
3.4.1 Activation/deactivation/registration
None identified.
3.4.2 Invocation and operation
Override category
In some cases where a connected party has an arrangement that presentation of his number is not allowed, there may
be certain categories of calling party that have the ability to override this restriction and have the connected number pre-
sented. This function is a national matter.
Problems may occur when the connected party does not belong to the same network as the calling party and in the
connected party's network the override category does not exist, but in the calling party's network this category does exist.
A problem occurs when a connected party who restricts presentation and assumes that his number is never presented,
receives a call from a calling party who has the override category.
The cases where the override category is applied is a national matter. Depending on bilateral agreement about the
application of the override category in country A, and the presentation not allowed arrangement of the connected party in
country B, country B may or may not deliver the connected line identification to country A. Agreements are also needed
with any transit network.
4. Network capabilities for charging
This Recommendation does not cover charging principles. Future Recommendations in the D-Series are expected to
contain that information. It shall be possible to charge the subscriber accurately for the service.
5. Interworking requirements
On calls destined for some non-ISDN networks, the connected number may be delivered to the originating ISDN without
the ability to indicate whether presentation is allowed or not. How the ISDN should behave in this case is for further study.
On calls destined for some other non-ISDN networks, no connected party number may be available to the ISDN and
therefore the full number of the connected party cannot be given to the calling party who has been provided with COLP. In
this situation a partial number shall be given unless no information is available whereupon a number unavailable indication
is given to the calling party.
6. Interaction with other supplementary services
6.1 Call Waiting
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.2 Call Transfer
Assume the situation where a User A has an established call with a UserB and wishes to transfer this call with User
B to a User C.
Except in the case where User C prohibits the presentation of his number, User C's number shall be presented:
- to User B upon successful completion of the transfer to UserC (independent of the type of transfer procedure
invoked by UserA) provided that User B has subscribed to COLP;
- to User A when User A is using normal or explicit transfer procedures and has subscribed to COLP. The con-
nected party's number will not be presented to User A if User A invokes the single step Call Transfer procedure.
Note that the connected number presentation may not be possible if interworking with a non-ISDN network is invoked in
the call transfer.
6.3 Connected Line Identification Presentation
Not applicable.
6.4 Connected Line Identification Restriction
The connected line identification will not be presented if the connected User has subscribed to COLR.
6.5 Calling Line Identification Presentation
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.6 Calling Line Identification Restriction
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.7 Closed User Group
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.8 Conference Calling
A Conference Controller who has also subscribed to COLP should be presented with the connected party's number when
that party is either part of the initial activation of the conference or is added as a new conferee to an existing conference.
Conferees in an existing conference who have subscribed to COLP will notreceive a new party's number whenever a
conference controller adds a new party to the conference.
6.9 Direct Dialling In
For further study.
6.10 Diversion services
6.10.1 Call Forwarding Busy (CFB)
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
Assume a calling User A, who has subscribed to COLP, places a call to a User B who is busy and this call is forwarded
to a User C. If User B has also subscribed to a notification option with his CFB service, calling User A may receive the for-
warded-to User C's number with the notification of the forwarding. In any event, assuming User C answers the call, User
C's number will be returned to User A unless User C has subscribed to COLR.
6.10.2 Call Forwarding No Reply (CFNR)
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
Assume a calling User A, who has subscribed to COLP, places a call to a User B who has subscribed to the CFNR ser-
vice, and who does not reply to the call within the subscribed time interval. If User B has also subscribed to a notification
option with his CFNR service, calling User A may receive the forwarded-to User C's number with the notification of the
forwarding. In any event, assuming User C answers the call, User C's number will be returned to User A unless User C has
subscribed to COLR.
6.10.3 Call Forwarding Unconditional (CFU)
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
Assume a calling User A, who has subscribed to COLP, places a call to a User B who has subscribed to the CFU ser-
vice. This call to User B would then be forwarded to User C. If User B has also subscribed to a notification option with his
CFU service, calling User A may receive the forwarded-to User C's number with the notification of the forwarding. In any
event, assuming User C answers the call, User C's number will be returned to User A unless User C has subscribed to
COLR.
6.11 Line Hunting
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.12 Three-Party Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.13 User-to-User Signalling
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.14 Multiple Subscriber Number
Assume User A, who has subscribed to COLP, places a call to a User B to which the network is applying the MSN ser-
vice. Assuming User B answers the call, the connected number at B (which may be identical to the called number) will be
returned to User A unless User B has subscribed to COLR. Other interactions are for further study.
6.15 Call Hold Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.16 Advice of Charge
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
7. Dynamic description
The dynamic description for this service is shown in Figure 1/I.251.5.
I.251.6 Connected Line Identification Restriction
1. Definition
Connected Line Identification Restriction (COLR) is a supplementary service offered to the connected party to restrict
presentation of the connected party's ISDN-number to the calling party.
2. Description
2.1 General description
When COLR is applicable and activated, the destination node provides the originating node with a notification that the
connected party's ISDN number is not allowed to be presented to the calling party. In this case no connected party number
is included in the call connected information to the calling party's installation.
Note - When COLR is subscribed to, some Network Providers may not wish to sendthe identity of the connected customer
to other Network Providers.
2.2 Specific terminology
None identified.
2.3 Qualifications on the applicability to telecommunications services
None identified, i.e., this supplementary service is applicable to all telecommunication services.
3. Procedures
3.1 Provision/withdrawal
COLR can be provided on a subscription basis or be generally available.
As a network provider option, COLR can be offered with several subscription options. The options apply separately to
each ISDN number. Subscription options are summarized below:
Subscription Option Values
COLR mode - permanent (active for all calls)
- temporary (specified by user per call)
Default - presentation restricted
(only for temporary mode) - presentation not restricted
It is a network provider option to specify either or both of the above options for all subscribers, for instance, in an
exchange or network.
3.2 Normal procedures
3.2.1 Activation/deactivation/registration
If subscribed to in the permanent mode, COLR is always activated. If subscribed to on a temporary basis, COLR is
activated upon explicit request for the service, or on default, on a particular call and is deactivated after that call.
3.2.2 Invocation and operation
If the calling party subscribes to Connected Line Identification Presentation and the connected party has COLR acti-
vated, the calling party shall receive an indication that the connected party number is not available.
3.3 Exceptional procedures
3.3.1 Activation/deactivation/registration
No exceptional procedures identified.
3.3.2 Invocation and operation
No exceptional procedures identified.
3.4 Alternative procedures
3.4.1 Activation/deactivation/registration
No alternative procedures identified.
3.4.2 Invocation and operation
Certain countries may define categories of subscribers that have the ability to override the presentation restriction and
have the connected party's ISDN number presented (e.g., the police).
The ability to have such override category is a national option.
When a call originates in one ISDN and terminates in another ISDN and COLR is applied, the rules and regulations of the
destination network (the host network) should apply. For example, if override category is not applicable in the originating
network but in the destination network a call with COLR applied can still be overridden in the destination network, whenever
information on the connected line is available for this network.
4. Network capabilities for charging
This Recommendation does not cover charging principles. Future Recommendations in the D-Series are expected to
contain that information. It shall be possible to charge the subscriber accurately for the service.
5. Interworking requirements
On calls to or via non-ISDNS, it cannot be assured that a COLR indication can be carried to the originating network.
As a national option the destination network shall have the possibility to restrict any information identifying the connected
party from being returned to the originating network when COLR is applicable. If a network receives a connected party ISDN
number without any indication of presentation allowed or restricted, the originating network (the host network) will act
according to its rules and regulations.
6. Interaction with other supplementary services
6.1 Call Waiting
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
Assume that a call from a User at C, invokes Call Waiting at UserB, who has subscribed to the COLR service. The UserB
would receive a call waiting indication but would not have his number returned when the call waiting indication is given.
6.2 Call Transfer
Assume that User A has an established call with UserB and wishes to transfer this call with UserB to a UserC.
If UserC has subscribed to COLR, then User A shall not receive the connected number when UserA invokes any call
transfer procedure. If UserC has subscribed to COLR, then UserB shall not receive the connected number during the trans-
fer of UserB to UserC.
6.3 Connected Line Identification Presentation
COLR will take precedence over COLP. The only occasion when a User subscribing to COLP can take precedence over
COLR is when the User has an override category. This is a national option.
6.4 Conencted Line Identification Restriction
Not relevant.
6.5 Calling Line Identification Presentation
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.6 Calling Line Identification Restriction
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.7 Closed User Group
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.8 Conference Call
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.9 Direct Dialling In
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.10 Diversion services
6.10.1 Call Forwarding Busy
When the diverted call is finally answered, no connected number will be presented to the calling party unless this party
has an override category. The latter is a national option.
6.10.2 Call Forwarding No Reply
When the diverted call is finally answered, no connected number will be presented to the calling party unless this party
has an override category. The latter is a national option.
6.10.3 Call Forwarding Unconditional
When the diverted call is finally answered, no connected number will be presented to the calling party unless this party
has an override category. The latter is a national option.
6.11 Line Hunting
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.12 Three-Party Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.13 User-to-User Signalling
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.14 Multiple Subscriber Number
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.15 Call Hold Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.16 Advice of Charge
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
7. Dynamic description
The dynamic description for this service is shown in Figure 1/I.251.6.
I.251.7 Malicious Call Identification
These services being identified need to be further studied and the descriptions are not yet included.
I.251.8 Sub-addressing
These services being identified need to be further studied and the descriptions are not yet included.