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q81_8sum.txt
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.81.8
Title : Stage 2 description for number identification supplementary
services
Study Group : XI - Switching and Signalling
Version : New
Date of adoption : 1992
Notes :
SUB-ADDRESSING (SUB)
Recommendation Q.81.8 defines the stage 2 description of the
Sub-addressing (SUB) supplementary service for the integrated services
digital network (ISDN) as provided by public telecommunications
operators. Stage 2 description 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).
Recommendation Q.81.8 is specified according to the methodology
specified in Recommendation Q.65.
Recommendation Q.81.8 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.81.8 does specify the requirements where
the service is provided to the user via a private ISDN. This
Recommendation 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.81.8 does not specify the additional requirements
where the service is provided to the user via a telecommunications
network that is not an ISDN.
The Sub-addressing (SUB) supplementary service allows the called
(served) user to expand his addressing capacity beyond the one given
by the public or private ISDN number.
The SUB supplementary service is applicable to all telecommunication
services.
Recommendation Q.81.8 is applicable to the stage 3 description
Recommendation for the ISDN Sub-addressing supplementary service. The
term "stage 3" is also 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).