3 Definitions and abbreviations
24.6283GPPCommon Basic Communication procedures using IP Multimedia (IM) Core Network (CN) subsystemProtocol specificationRelease 17TS
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
announcement: service related message sent to a user that can be of any type of media e.g. a voice message or a
video-clip
communication: transfer of information between two or more users, entities, processes or nodes according to some agreed conventions
NOTE: See ITU-T Recommendation I.112 modified [11].
early media: media sent before a communication is established
in-band announcement: announcement sent by the network using the bearer established for a communication
Originating Application Server (O-AS): controlling application server responsible for the services provided to the originating user
Terminating Application Server (T-AS): controlling application server responsible for the services provided to the terminating user
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
3pcc 3rd party call control
ACR Automatic Call Rejection
AS Application Server
B2BUA Back-to-Back User Agent
IFC Initial Filter Criteria
IMS IP Multimedia Subsystem
ISDN Integrated Services Digital Network
MGCF Media Gateway Control Function
MGW Media GateWay
MRFC Media Resource Function Controller
MRFP Media Resource Function Processors
NDUB Network Determined User Busy
O-AS Originating Application Server
P-CSCF Proxy Call Session Control Function
PSTN Public Switched Telephone Network
S-CSCF Serving Call Session Control Function
SDP Session Description Protocol
SIP Session Initiation Protocol
T-AS Terminating Application Server
T-MGF Trunking Media Gateway Function
UDUB User Determined User Busy
UE User Equipment
URL Uniform Resource Locator