FM.IceLink.Sdp.Sctp Namespace

AB: Legacy attribute. To be removed when Firefox and Chrome stop using it. The sctpmap attribute maps from a port number (as used in an "m=" line) to an encoding name denoting the payload format to be used on top of the SCTP association or the actual protocol running on top of it. Last appears in https://tools.ietf.org/html/draft-ietf-mmusic-sctp-sdp-06#page-6 Has been replaced in subsequent drafts but is used in Firefox and Chrome for now.

The attribute can be associated with an m- line to indicate the maximum message size (indicated in bytes) that an SCTP endpoint is willing to receive on the SCTP association associated with the m- line. Different attribute values can be used in each direction.

An SDP media description with a transport protocol of "RTP/AVP" or "RTP/SAVP".

The attribute can be associated with an SDP media description (m- line) with a 'UDP/DTLS/SCTP' or a 'TCP/DTLS/SCTP' proto value, in which case the m- line port value indicates the port of the underlying transport-layer protocol (UDP or TCP), on which SCTP is carried, and the 'sctp-port' value indicates the SCTP port.