3 Definitions and abbreviations
29.1633GPPInterworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networksTS
3.1 Definitions
For the purposes of the present document, the terms and definitions given in TR 21.905 [6], ITU-T Recommendation E.164 [48] and the following apply:
Carrier textphone mode: a mode for text communication, where continuous signals (i.e. a carrier tone) are present on the connection irrespective of whether text is being exchanged or not.
Carrierless textphone mode: a mode for text communication, where signals are only present on the connection when text is being exchanged. E.g.: Baudot
SS7 signalling function: function in the CS network, which has the capabilities to transport the SS7 MTP-User parts ISUP and BICC+STCmtp
SIP signalling function: function in the IM CN subsystem, which has the capabilities to transport SIP
Incoming or Outgoing: used in the present document to indicate the direction of a call (not signalling information) with respect to a reference point.
Incoming MGCF (I‑MGCF): entity that terminates incoming SIP calls from the IMS side and originates outgoing calls towards the CS side using the BICC or ISUP protocols.
Outgoing Interworking Unit (O‑MGCF): entity that terminates incoming BICC or ISUP calls from the CS side and originates outgoing calls towards the IMS using SIP.
Root Termination: refers to Media Gateway as an entity in itself, rather than a Termination within it. A special TerminationID, "Root" is reserved for this purpose. See ITU-T Recommendation H.248.1. [2]
Signalling Transport Converter (STC): function that converts the services provided by a particular Signalling Transport to the services required by the Generic Signalling Transport Service.
STCmtp: Signalling Transport Converter on MTP. See ITU-T Recommendation Q.2150.1 [29].
BICC+STCmtp: this terminology means that BICC signalling always needs to be used on top of STCmtp sublayer.
diverting URI: the URI of the node by which the existing communication was last diverted/forwarded.
diverted-to URI: the URI to which the existing communication is diverted/forwarded to.
ICE lite: The lite implementation of the Interactive Connectivity Establishment (ICE) specified in IETF RFC 8445 [156].
Full ICE: The full implementation of the Interactive Connectivity Establishment (ICE) specified in IETF RFC 8445 [156].
3.2 Abbreviations
For the purposes of the present document, the abbreviations as defined in TR 21.905 [6] and the following apply:
18x A SIP status-code in the range 180 through 189
2xx A SIP status-code in the range 200 through 299
3PTY Three Party
3xx A SIP status-code in the range 300 through 399
4xx A SIP status-code in the range 400 through 499
5xx A SIP status-code in the range 500 through 599
6xx A SIP status-code in the range 600 through 699
AAL1 ATM Adaptation Layer type 1
ACR Anonymous Call Rejection
AMR Adaptive Multi-Rate
AMR-WB Adaptive Multi-Rate – WideBand
AMR-WB IO Adaptive Multi-Rate – WideBand Inter-operable Mode, included in the EVS codec
ANM Answer Message
APM Application Transport Message
APP APPlication-defined RTCP packet
APRI Address Presentation Restriction Indicator
ATP Access Transport Parameter
BC Bearer Capability
BCI Backward Call Indicators
BGCF Breakout Gateway Control Function
BICC Bearer Independent Call Control
CAT Customized Alerting Tones
CB Communication Barring
CCNR Call Completion on No Reply
CCSS Call Completion Service Set-up
Cda Call Deflection Alerting
Cdi Call Deflection Immediate
CDIV Communication Diversion
CdPN Called Party Number
CFB Call Forwarding Busy
CFNR Call Forwarding No Reply
CGB Circuit Group Blocking
CgPN Calling Party Number
CIC Carrier Identification Code
CMR Codec Mode Request
CON Connect
CONF Conference
COT Continuity
CPC Calling Party’s Category
CPG Call ProGress message
CSI Carrier Selection Information
DSCP DiffServ Code Point
DTX Discontinuous Transmission
ECN Explicit Congestion Notification
ECN-CE ECN Congestion Experienced
EVS Enhanced Voice Services
EVS-CMR Codec Mode Request for EVS
FAC Facility
FQC Frame Quality Classification
GN Generic Number
GRS Group Reset
GVNS Global Virtual Network Service
H/W Hardware
ICE Interactive Connectivity Establishment
ICS IMS Centralized Services
IDR Identification Request
IEPS International Emergency Preference Scheme
I-MGCF Incoming MGCF
IM-MGW IP Multimedia Media Gateway Function
INF Information
INR Information Request
IRS Identification Response
ITCC International Telecommunication Charge Card
ITU-T International Telecommunication Union – Telecommunication Standardization Sector
MCID Malicious Communication Identification
M3UA MTP-L3 User Adaptation layer
MLPP Multi-Level Precedence and Pre-emption
MONA Media Orientation Negotiation Acceleration
MPC Media Preconfigured Channel
MPS Multimedia Priority Service
MRFP Media Resource Function Processor
MSN Multiple Subscriber Number
MSU Message Signalling Unit
MWI Message Waiting Indication
NOA Nature Of Address indicator
NPDI Number Portability Database Dip Indicator
OIP Originating Identification Presentation
OIR Originating Identification Restriction
OLI Originating Line Information
O-MGCF Outgoing MGCF
PI Progress Indicator
PIDF Presence Information Data Format
PSAP Public Safety Answering Point
REV Reverse Charging
RLC Release Complete
RSC Reset Circuit
RTCP RTP Control Protocol
RTP Real-time Transport Protocol
SAM Subsequent Address Message
SCTP Stream Control Transmission Protocol
SDPCapNeg SDP Capability Negotiation
SGW Signalling Gateway
SPC Signalling Preconfigured Channel
ST Sending Terminated
STUN Session Traversal Utilities for NAT
TCAP Transaction Capabilities Application Part
TDM Time Division Multiplex
TIP Terminating Identification Presentation
TIR Terminating Identification Restriction
TMR Transmission Medium Requirement
TMU Transmission Medium Used
TNL Transport Network Layer
TNS Transit Network Selection
TP Terminal Portability
UA User Agent
UAC User Agent Client
UDI Unrestricted Digital Information
UDI-TA Unrestricted Digital Information with Tones/Announcements
UID User Interactive Dialog
URI Uniform Resource Identifier
USI User Service Information
UUS User-to-User Signalling
XML eXtensible Markup Language