SDP

SDP

SDP is intended for describing multimedia sessions for the purposes of session announcement, session invitation, and other forms of multimedia session initiation. SDP is used from ​​VOIP​​​ signalling protocols like ​​SIP​​​, ​​H.323​​​ and some minor ​​VOIP​​ protocols to transfer media setup information about a multi media client from A to B.

SDP is used by SAP - the Service Announcement Protocol.SDP is used by​​SIP​​

IETF RFCs

​​RFC 4566​​: Session Description Protocolobsolete​​RFC2327​​: Session Description Protocol​​RFC 3388​​: Grouping of Media Lines in the Session Description Protocol (SDP)obsolete​​RFC 3266​​: Support for IPv6 in Session Description Protocol (SDP)IANA SDP parameters:​​description

v=  (protocol version)        o=  (owner/creator and session identifier).        s=  (session name)        i=* (session information)        u=* (URI of description)        e=* (email address)        p=* (phone number)        c=* (connection information - not required if included in all media)        b=* (bandwidth information)        One or more time descriptions (see below)        z=* (time zone adjustments)        k=* (encryption key)        a=* (zero or more session attribute lines)        Zero or more media descriptions (see below)

Time description

t=  (time the session is active)        r=* (zero or more repeat times)

Media description

m=  (media name and transport address)        i=* (media title)        c=* (connection information - optional if included at session-level)        b=* (bandwidth information)        k=* (encryption key)        a=* (zero or more media attribute lines)

RTP Payload Type Numbers

RTP payload type numbers appear in the m= and rtpmap lines of the SDP, but these numbers are not defined in the SDP RFCs, there is more information here: ​​RTP​​.

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