3 Definitions and abbreviations

24.5283GPPCommon Basic Communication proceduresProtocol specificationRelease 8TISPANTS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in TR 180 000 [16] and the following 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

Incoming Media Gateway Control Function (IMGCF): MGCF that terminates incoming calls from IMS and originates call the BICC/ISUP protocols

Originating Application Server (O-AS): controlling application server responsible for the services provided to the originating user

Outgoing Media Gateway Control Function (O-MGCF): MGCF that terminates incoming calls using BICC/ISUP protocols and originates calls to IMS

Terminating Application Server (T-AS): controlling application server responsible for the services provided to the terminating user

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

IBCF Interconnection Border Control Function

I-CSCF Interrogating Call Session Control Function

IFC Initial Filter Criteria

I-MGCF Incoming Media Gateway Control Function

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

NGN Next Generation Network

O-AS Originating Application Server

O-MGCF Outgoing Media Gateway Control Function

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