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q81_2sum.txt
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.81.2
Title : Stage 2 description for number identification supplementary
services
Study Group : XI - Switching and Signalling
Version : New
Date of adoption : 1992
Notes :
Recommendation Q.81.2 defines the stage 2 of the Multiple Subscriber
Number (MSN) supplementary service for the integrated services digital
network (ISDN) as provided by telecommunications operators. Stage 2
identifies the functional capabilities and the information flows
needed to support the stage 1 service description. The stage 2
description also identifies user operations not directly associated
with a call (see Recommendation I.130).
This Recommendation is specified according to the methodology
specified in Recommendation Q.65.
Recommendation Q.81.2 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.81.2 does not specify the requirements
where the service is provided to the user via a private ISDN.
Recommendation Q.81.2 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.81.2 does not specify the additional requirements
where the service is provided to the user via a telecommunications
network that is not an ISDN.
The MSN supplementary service provides the possibility for assigning
multiple numbers to a single public or private access.
This allows e.g.:
1) a calling user to select, via the public network, one or
multiple distinct terminals out of a multiple choice;
2) to identify the terminal to the network for the application
of other supplementary services.
It is considered:
- that in the case of a basic access some service providers
may not have knowledge or control over what is connected, e.g. a
private ISDN or a terminal configuration;
- that service providers have differing numbering methods.
The MSN supplementary service is applicable to all telecommunication
services.
Recommendation Q.81.2 is applicable to the stage 3 Recommendations
for the ISDN MSN supplementary service as defined in
Recommendation I.130.
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).