3 Definitions and abbreviations

24.6423GPPCompletion of Communications to Busy Subscriber (CCBS) and Completion of Communications by No Reply (CCNR) using IP Multimedia (IM) Core Network (CN) subsystemProtocol specificationRelease 16TS

3.1 Definitions

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

busy: See ITU-T Recommendation I.221 [8], subclause 2.1.5.

call information retention: A procedure of network A to store the call information of a specific call so that it can be used for that call.

caller: The user who originated the call and to whom the CCBS service is provided.

callee: The user which is identified as destination B.

CC: Completion of Communication

CC busy: Any one of the following conditions will cause a CCBS busy condition:

– maximum number of calls reached at user A (see ITU-T Recommendation I.221 [8], subclause 2.1.3, item 2));

– no resources (bandwidth) available at user A;

– CC recall pending on user A.

CC call: A call generated by the network connecting the caller to the callee, resulting from the callers’ acceptance of a CC recall.

CC recall: An indication informing the caller that the network is ready to initiate a CC call to the callee and that the network is awaiting a response to this indication.

CC request: An instance of an activation of the CCBS/CCNR/CCNL service which is held in a queue pending the correct conditions for the CCBS/CCNR/CCNL service to be completed.

Suspended CC request: A CC request which cannot be served even if the callee is in the appropriate state because the caller is busy.

CC request retention: If an attempt to establish a CC call fails because the destination is busy again, then the network provider option "CC request retention" defines whether the CC supplementary service is continued or not, i.e. if the "CC request retention" is supported, the original CC request retains its position in the queue B, and monitoring of user B shall continue. Otherwise the CC request is revoked.

CC service duration timer: A maximum time a CC service will remain activated for the caller within the network.

destination B: The entity addressed in the original call.

long-term denial: The network cannot accept user A’s request to activate the CC service and a later attempt to activate the CC service for the same destination B will also be rejected.

queue A: A buffer at the originating side for the control of CC requests associated with the caller.

queue B: A buffer at the terminating side for the control of CC requests associated with destination B.

retain option: The retain option, if supported in both the originating and destination network, will maintain the CC request in the destination B queue, if a CC call has failed due to destination busy condition.

short-term denial: The network temporarily cannot accept user A’s request to activate the CC service. A later attempt to activate the CC service for the same destination B may succeed.

UE-A: The caller’s UE.

UE-B: The callee’s UE.

3.2 Abbreviations

For the purposes of the present document, the following abbreviations apply:

AOC Advice Of Charge

AS Application Server

CB Communication Barring

CC Completion of Communications

CCBS Completion of Communications to Busy Subscriber

CCNL Completion of Communications on Not Logged-in

CCNR Completion of Communications on No Reply

CD Communication Deflection

CDIV Call DIVersion

CFB Communication Forwarding Busy

CFNL Communication Forwarding on No Logged-in

CFU Communication Forwarding Unconditional

CN Core Network

CNR Completion of communication on No Reply

CONF CONFerence calling

CS Circuit Switched

CW Communication Waiting

ECT Explicit Communication Transfer

HOLD Communication Hold

IFC Initial Filter Criteria

IM IP Multimedia

IMS IP Multimedia Subsystem

IP Internet Protocol

ISDN Integrated Service Data Network

MCID Malicious Communication IDentification

MiD Multi-iDentity

MIME Multipurpose Internet Mail Extensions

MuD Multi-Device

OIP Originating Identification Presentation

OIR Originating Identification Restriction

PLMN Public Land Mobile Network

PSTN Public Switch Telephone Network

SIP Session Initiation Protocol

TIP Terminating Identification Presentation

TIR Terminating Identification Restriction

UE User Equipment