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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.951.2
Title : Stage 3 description for number identification supplementary
services using DSS 1
Study Group : XI - Switching and Signalling
Version : New
Date of adoption : 1992
Notes :
MULTIPLE SUBSCRIBER NUMBER (MSN)
The Multiple Subscriber Number (MSN) supplementary service provides
the possibility for assigning multiple ISDN numbers to a single public
or private access. Note that this allows, e.g.,:
1) a calling user to select, via the public network, one
or multiple distinct terminals out of a multiple choice (e.g.
in a passive bus configuration);
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. private ISDN or a terminal configuration;
- that Administrations have differing numbering methods;
- that common international terminal specifications are
desired.
The stage 1 description, i.e. the MSN supplementary service description
as seen from the user, can be found in Recommendation I.251.2.
The stage 2 description, i.e. the information flow for the MSN
supplementary service, can be found in Recommendation Q.81.2.
Recommendation Q.951.2 specifies the stage 3 description, i.e. the
protocol requirements for the MSN supplementary service at the
coincident S and T reference point or at the T reference point (as
defined in Recommendation I.411).
The MSN supplementary service enables each individual terminal on one
access to have one or more identities, by which one individual
terminal (e.g. at a passive bus configuration) can be discriminated
from the others.
The Multiple Subscriber Number may be either:
- the whole ISDN number; or
- a part of the ISDN number (the least significant "n"
digit(s) where "n" may be a number up to the full length of
the ISDN number, and shall be a number large enough to allow
all terminals on an access to be assigned an individual
number); or
- as a service provider option, a number which can be mapped
from the ISDN number by the network at the destination network
side.
National or international prefixes cannot form part of the Multiple
Subscriber Number.
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).