3 Definitions, symbols and abbreviations
29.3323GPPMedia Gateway Control Function (MGCF) - IM Media GatewayMn interfaceRelease 17TS
3.1 Definitions
For the purposes of the present document, the [following] terms and definitions [given in … and the following] apply.
Context (H.248): A context is an association between a number of Terminations. The context describes the topology (who hears/sees whom) and the media mixing and/or switching parameters if more than two terminations are involved in the association.
Package (H.248): Different types of gateways may implement terminations which have differing characteristics. Variations in terminations are accommodated in the protocol by allowing terminations to have optional properties. Such options are grouped into packages, and a termination may realise a set of such packages.
Termination (H.248): A termination is a logical entity on an MGW which is the source and/or sink of media and/or control streams. A termination is described by a number of characterising properties, which are grouped in a set of descriptors which are included in commands. Each termination has a unique identity (TerminationID).
Termination Property (H.248): Termination properties are used to describe terminations. Related properties are grouped into descriptors. Each termination property has a unique identity (PropertyID).
For the purposes of the present document, the following terms and definitions as defined in 3GPP TS 29.163 [4] apply:
ICE lite
Full ICE.
3.2 Symbols
For the purposes of the present document, the following symbols apply:
Mn Interface between the media gateway control function and the IMS media gateway.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations given in TR 21.905 [40] and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 [40].
AMR Adaptive MultiRate
BICC Bearer Independent Call Control
CN Core Network
CS Circuit-Switched
DTMF Dual Tone Multi Frequency
CE Congestion Experienced
ECN Explicit Congestion Notification
FFS For further study
GSM Global System for Mobile communications
ICE Interactive Connectivity Establishment
IETF Internet Engineering Task Force
IM IP Multimedia
IM-MGW IP Multimedia Media Gateway
IMS IP Multimedia Subsystem
IP Internet Protocol
ISDN Integrated Services Digital Network
ISUP ISDN User Part
MG/MGW Media GateWay
MGC Media Gateway Controller
MGCF Media Gateway Control Function
MIME Multipurpose Internet Mail Extensions
MPS Multimedia Priority Service
n.a. not applicable
PDH Plesiochronous Digital Hierarchy
PES PSTN/ISDN Emulation Subsystem
PSTN Public Switched Telephone Network
PT Payload Type
R2 (ETSI TISPAN NGN) Release 2
RFC Request For Comment; this includes both discussion documents and specifications in the IETF domain
RTCP RTP Control Protocol
RTP Real-time Transport Protocol
SCTP Stream Control Transmission Protocol
SDH Synchronous Digital Hierarchy
SDP Session Description Protocol
SDPCapNeg SDP Capability Negotiation
SIP Session Initiation Protocol
SONET Synchronous Optical NETwork
SS Silence Suppression
SS7 Signalling System No. 7
STUN Session Traversal Utilities for NAT
TDM Time Division Multiplexing
TISPAN Telecommunications and Internet converged Services and Protocols for Advanced Networking
TMGW Trunking MGW
TS Technical Specification (3GPP, ETSI)
VBD VoiceBand Data