3 Definitions, symbols and abbreviations

24.1733GPPIMS Multimedia telephony communication service and supplementary servicesRelease 18Stage 3TS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in 3GPP TS 21.905 [1] apply.

MMTEL voice: a multimedia telephony communication session as described in clause 5.2 with only audio or only real-time text or only both audio and real-time text.

MMTEL video: a multimedia telephony communication session as described in clause 5.2 with video.

For the purposes of the present document, the following terms and definitions given in 3GPP TS 22.011 [37] apply:

3GPP PS data off

3GPP PS data off exempt service

For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.229 [13] apply:

3GPP PS data off status

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.122 [41] apply:

Equivalent Home PLMN (EHPLMN)

Home PLMN (HPLMN)

Visited PLMN (VPLMN)

For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.501 [42] apply:

NG-RAN

For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.174 [43] apply:

MuD

MiD

3.2 Abbreviations

For the purposes of the present document, the following abbreviations apply:

CS Circuit Switched

CN Core Network

ICSI IMS Communication Service Identifier

IP Internet Protocol

IM IP Multimedia

MMTEL Multimedia Telephony

MPS Multimedia Priority Service

NG-RAN Next Generation Radio Access Network

PS Packet Switched

UDP User Datagram Protocol

UDPTL UDP Transport Layer