3 Definitions and abbreviations

24.6543GPPClosed User Group (CUG) using IP Multimedia (IM) Core Network (CN) subsystem, Protocol SpecificationRelease 17TS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in 3GPP TS 22.173 [1] 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

NOTE 1: The index is also used by the network to indicate to the terminating user the CUG from which an incoming communication has originated. This index has only local significance, i.e. the index used by the originating user is, in general, different from the index used by the terminating user to identify the same CUG.

CUG interlock code: means of identifying CUG membership within the network

NOTE 2: At the originating side, if a CUG match exists, the CUG index identifying a CUG maps to the CUG interlock code for that CUG. If a CUG match exists at the terminating side the CUG interlock code identifying a CUG maps to the CUG index representing that CUG. CUG interlock code has relevance on NN level between AS.

CUG manager: authority representing the interests of all the members of a CUG

NOTE 3: By planning and controlling the membership and members’ options, the manager can provide the overall CUG service expected by the members as a whole. The CUG manager need not be a CUG member and the concept has no signalling implications.

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

NOTE 4: A preferential CUG applies to a Public ID.

3.2 Abbreviations

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