L.4 Data transport using UDP/IP

26.1143GPPIP Multimedia Subsystem (IMS)Media handling and interactionMultimedia telephonyRelease 18TS

An MTSI client in terminal supporting facsimile transmission using UDP/IP shall support:

– encapsulating and decapsulating T.30 [92] into/from Internet Facsimile Protocol (IFP) packets [93];

– UDPTL-based transport format in ITU-T Recommendation T.38 [93], and:

– redundancy transmission of primary IFP packets, see ITU-T Recommendation T.38 Clause 9.1.4.1 [93].

An MTSI client in terminal supporting facsimile transmission using UDP/IP may support:

– the parity FEC scheme specified in ITU-T Recommendation T.38 Annex C [93].

An IFP packet may include either partial, single or multiple HDLC frames.

A T.38 packet may include both one IFP packet and one or more redundancy/FEC information packets.