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TS 24.654 (CT1)
Closed User Group (CUG) using IMS – Protocol specification

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V15.0.0 (PDF)  2017/12  xx p.
V14.0.0  2017/03  23 p.
V13.0.0  2015/12  22 p.
V12.0.0  2014/09  22 p.
V11.1.0  2013/03  22 p.
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V8.6.0  2013/03  20 p.

Rapporteur:  Mr. Kreipl, Michael
Antecedent:  TS 24.454

This TS specifies the stage three Protocol Description of the Closed User Group (CUG) service, based on stage one and two of the ISDN Communication diversion supplementary services. It provides the protocol details in the IP Multimedia (IM) Core Network (CN) subsystem based on the Session Initiation Protocol (SIP) and the Session Description Protocol (SDP).

The CUG service enables users to form groups of members, whose communication profile is restricted for incoming and outgoing communications.

Members of a specific CUG can communicate among themselves but not, in general, with users outside the group.

Specific CUG members can have additional capabilities that allow them to initiate outgoing communications to users outside the group, and/or to accept incoming communications from users outside the group. Specific CUG members can have additional restrictions that prevent outgoing communications to other members of the CUG, or prevent incoming communications from other members of the CUG.

A closed user group consists of a number of members from one or more public, and/or private networks. A specific user may be a member of one or more CUGs. Subscription to a closed user group shall be defined for all communication services, or in relation to one, or to a list of communication services.


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1  Scope [R8]PDF-p. 6
2  References [R8]
3  Definitions and abbreviations [R8]
4  Closed User Group (CUG) [R8]PDF-p. 8
4.1  Introduction
4.2  Description
4.3  Operational requirements
4.4  Coding requirementsPDF-p. 10
4.5  Signalling requirements
4.6  Interaction with other services
4.7  Interactions with other networks
B  Change historyPDF-p. 21

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