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Content for  TS 24.654  Word version:  16.0.0

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1  ScopeWord‑p. 6

The present document 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 present document is applicable to User Equipment (UE) and Application Servers (AS) which are intended to support the CUG supplementary service.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TS 22.173: "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services, stage 1".
[2]
TS 24.229: "Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
[3]  Void
[4]  Void
[5]
TS 24.238: "Session Initiation Protocol (SIP) based user configuration; stage 3".
[6]
TS 24.623: "Extensible Markup Language (XML) Configuration Access Protocol (XCAP) over the Ut interface for Manipulating Supplementary Services".
[7]
RFC 5621:  "Message Body Handling in the Session Initiation Protocol (SIP)".
[8]
TS 24.174: "Support of Multi-Device and Multi-Identity in IMS; Stage 3".
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3  Definitions and abbreviations

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TS 22.173 and the following apply:
basic service:
bearer or teleservice. Within the scope of SIP based networks the identification of a bearer or teleservice can be derived from the SDP used
Closed User Group (CUG) communication:
closed user group communication is a communication which is restricted to a pre-defined group of users
Closed User Group (CUG) member:
user who has subscribed to the CUG service and is one of the users in the group formed by a particular closed user group
CUG index:
parameter used by the originating user to select a particular CUG when originating a communication
CUG interlock code:
means of identifying CUG membership within the network
CUG manager:
authority representing the interests of all the members of a CUG
incoming access:
arrangement which allows a member of a closed user group to receive communications from outside the closed user group
incoming communications barred within a closed user group:
access restriction that prevents a closed user group member from receiving communications from other members of that group
outgoing access:
arrangement which allows a member of a closed user group to place communications outside the closed user group
outgoing communications barred within a closed user group:
access restriction that prevents a closed user group member from placing communications to other members of that group
preferential CUG:
user subscribing to preferential CUG nominates a CUG index which the network uses as a default to identify the required CUG in the absence of any CUG information in the outgoing communication request
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3.2  AbbreviationsWord‑p. 7

For the purposes of the present document, the following abbreviations apply:
ACR
Anonymous Call Rejection
AS
Application Server
CDIV
Communication DIVersion
CONF
CONFerence calling
CUG
Closed User Group
ECT
Explicit Communication Transfer
HOLD
communication HOLD
IA
Incoming Access
ICB
Incoming Communication Barring
IMS
IP Multimedia Subsystem
IP
Internet Protocol
ISDN
Integrated Service Data Network
MCID
Malicious Communication IDentification
MiD
Multi-iDentity
MuD
Multi-Device
OA
Outgoing Access
OCB
Outgoing Communication Barring
OIP
Originating Identification Presentation
OIR
Originating Identification Restriction
PSTN
Public Switched Telephone Network
SDP
Session Description Protocol
SIP
Session Initiation Protocol
TIP
Terminating Identity Presentation
TIR
Terminating Identification Restriction
UA
User Agent
UE
User Equipment
URI
Universal Resource Identifier
XML
eXtensible Markup Language
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