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q731_8s.txt
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.731.8
Title : Stage 3 description for number identification supplementary
services using signalling system No. 7
Study Group : XI - Switching and Signalling
Version : New
Date of adoption : 1992
Notes :
SUB-ADDRESSING (SUB)
The Sub-address supplementary service allows the called (served) user
to expand his addressing capacity beyond the one given by the ISDN
number.
The stage 1 service description is given in Recommendation I.251.8 and
the stage 2 functional capabilities and information flows are given in
Recommendation Q.81.8. The stage 3 description of the sub-address
supplementary service uses the ISDN user part protocol as defined in
Recommendations Q.761 to Q.764 and Q.767.
The sub-address information is access significant information which is
transported transparent through the network in the access transport
parameter in the initial address message (IAM).
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).