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q83_4sum.txt
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.83.4
Title : Stage 2 description for call completion supplementary services
Study Group : XI - Switching and Signalling
Version : New
Date of adoption : 1991
Notes :
TERMINAL PORTABILITY
Recommendation Q.83.4 defines the stage 2 of the integrated services
digital network (ISDN) as provided by telecommunications operators for
the Terminal Portability (TP) supplementary service. Stage 2
identifies the functional capabilities and the information flows
needed to support the service as description. The stage 2 description
also identifies user operations not directly associated with a call
(see Recommendation I.130).
Recommendation Q.83.4 is specified according to the methodology
specified in Recommendation Q.65.
Recommendation Q.83.4 does not formally describe the relationship
between this supplementary service and the basic call but, where
possible, this information is included for guidance.
In addition, Recommendation Q.83.4 does not specify the requirements
where the service is provided to the user via a private ISDN.
Recommendation Q.83.4 does not specify the requirements for the
allocation of defined functional entities within a private ISDN; it
does however, define which functional entities may be allocated to a
private ISDN. Recommendation Q.83.4 does not specify the additional
requirements where the service is provided to the user via a
telecommunications network that is not an ISDN.
The TP supplementary service allows a user to move a terminal from
one socket to another within one given basic access during the active
state of a call.
The portability of a terminal during the idle state is part of the
basic access capabilities and does not require any procedure. The
portability of a terminal in the call establishment and in the call
clearing phases is not possible.
The TP supplementary service applies to some interactive
telecommunication services requiring the attendance of a human being,
such as telephony, videotelephony, etc. However, the network will not
take any action to restrict its applicability.
The TP supplementary service does not apply to non-interactive
services such as facsimile, teletex, mixed-mode, computer
communication, etc. The relative terminals should not provide for the
above mentioned capabilities. It is a user's responsibility to resume
the call with a terminal which is compatible both with the remote
terminal and with the type of connection previously established.
Recommendation Q.83.4 is applicable to the stage 3 Recommendations
for the ISDN integrated services digital network TP supplementary
service.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword 2.0: UPI=ITU-5265; ASCII: UPI=ITU-2488).