ITU-T Recommendations

Gateway control protocols may require additional session description protocol (SDP) codepoints for specific interworking functions supported at bearer plane level beyond for example the SDP information used by call control protocols.

Supplement 14 to ITU-T H-series Recommendations summarizes SDP codepoints that have been identified in the time-frame from June 2000 to the date of approval of this Supplement. It identifies SDP codepoints that meet ITU-T H.248.x sub-series requirements for gateway control protocols and that are available for general use by the wider standards community.

Release 1 of this Supplement covers:

– SDP codepoints for the ITU-T H.248 based control of transport layer security (TLS) and datagram transport layer security (DTLS) traffic in ITU-T H.248 media gateways.

– Preliminary SDP codepoint information for stream control transmission protocol (SCTP) traffic [ITU-T H.248.97].

Release 2 adds:

– Information about the IANA registration process.– Fixes SDP codepoint information as required for [ITU-T H.248.97].

This Supplement is used as a codepoint repository for the Internet Engineering Task Force (IETF) driven registration process of SDP codepoints with the Internet Assigned Numbers Authority (IANA).