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 titles ('i=' line for
each session or media).