3 Definitions, symbols and abbreviations
29.1623GPPInterworking between the IM CN subsystem and IP networksRelease 17TS
3.1 Definitions
For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [7] and the following apply:
End-to-end security: media protection between two IMS UEs without being terminated by any intermediary node.
ICE lite: The lite implementation of the Interactive Connectivity Establishment (ICE) specified in IETF RFC 8445 [62].
Full ICE: The full implementation of the Interactive Connectivity Establishment (ICE) specified in IETF RFC 8445 [62].
IM CN subsystem: (IP Multimedia CN subsystem) comprises of all CN elements for the provision of IP multimedia applications over IP multimedia sessions
IP multimedia session: set of multimedia senders and receivers and the data streams flowing from senders to receivers
IP multimedia sessions are supported by the IP multimedia CN Subsystem and are enabled by IP connectivity bearers (e.g. GPRS as a bearer). A user may invoke concurrent IP multimedia sessions.
MSC Server enhanced for ICS: An MSC Server that supports the network based ICS functionality.
MSC Server enhanced for SRVCC: An MSC Server that supports the network based SRVCC functionality.
3.2 Symbols
For the purposes of the present document, the following symbols apply:
Mm Reference Point between a CSCF/BGCF/IMS-ALG and an IP multimedia network.
Mx Reference Point between a CSCF/BGCF/MSC Server enhanced for ICS/MSC Server enhanced for SRVCC and IBCF.
Mb Reference Point defined in 3GPP TS 23.002 [5] and is IP based.
Ix Reference Point between IBCF and TrGW or CS-IBCF and CS-TrGW.
3.3 Abbreviations
For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [7] and the following apply: An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in 3GPP TR 21.905 [7].
ALTC ALTernative Connection
APP APPlication-defined RTCP packet
ATCF Access Transfer Control Function
ATGW Access Transfer Gateway
B2BUA Back-to-Back User Agent
BFCP Binary Floor Control Protocol
BGCF Breakout Gateway Control Function
CCM Codec Control Messages
CS-TrGW CS (domain) TrGW
CVO Coordination of Video Orientation
DBI Delay Budget Information
DRVCC Dual Radio Voice Call Continuity
ECN Explicit Congestion Notification
ECN-CE ECN Congestion Experienced
EVS Enhanced Voice Services
FECC Far End Camera Control
FIR Full Intra Request
IBCF Interconnect Border Control Function
ICE Interactive Connectivity Establishment
ICS IMS Centralized Services
I-CSCF Interrogating CSCF
IMS-ALG IMS – Application Level Gateway
ITU-T International Telecommunication Union – Telecommunication Standardization Sector
MboIP Mb over IP
MPS Multimedia Priority Service
MRFP Multimedia Resource Function Processor
MSRP Message Session Relay Protocol
MTSI Multimedia Telephony Service for IMS
NAT/NAPT Network Address Translation / Network Address and Port Translation
NA (P) T-PT Network Address (and Port) Translation – Protocol Translation
OMR Optimal Media Routeing
P-CSCF Proxy CSCF
ROI Region of Interest
RTCP Real Time Control Protocol
SCTP Stream Control Transmission Protocol
SDPCapNeg SDP Capability Negotiation
SIP UA SIP User Agent
STUN Session Traversal Utilities for NAT
THIG Topology Hiding Internetwork Gateway
TLS Transport Layer Security
TMMBN Temporary Maximum Media Stream Bit Rate Notification
TMMBR Temporary Maximum Media Stream Bit Rate Request
TRF Transit and Roaming Function
TrGW Transition GateWay
UAC User Agent Client
UAS User Agent Server
URN Uniform Resource Name
WAN Wide Area Network