"The Session Description Protocol (SDP) has been extended with a capability negotiation mechanism framework that allows the endpoints to negotiate transport protocols and attributes. This framework has been extended with a media capabilities negotiation mechanism that allows endpoints to negotiate additional media-related capabilities. This negotiation is embedded into the widely used SDP offer/answer procedures. This memo extends the SDP capability negotiation framework to allow endpoints to negotiate three additional SDP capabilities. In particular@ this memo provides a mechanism to negotiate bandwidth (""b="" line)@ connection data (""c="" line)@ and session or media titles (""i="" line for each session or media)"
RFC 7006-2013 history
2013RFC 7006-2013 Miscellaneous Capabilities Negotiation in the Session Description Protocol (SDP)