Protocol
SDP
Session Description Protocol
Textual session description: media lines, codecs (rtpmap/fmtp), ICE candidates, and direction attributes. Carried in SIP, WebRTC, and MGCP/H.248 as the offer/answer language for RTP.
Layers
Tags
offer-answerrtpmapmediaicerfc8866
Sources
- RFC 8866 (SDP)
- RFC 3264 (offer/answer)
Related protocols
SIP
Lab readyText-based signaling for creating and managing sessions. Methods (INVITE, ACK, BYE, REGISTER…) and response codes resemble HTTP; SDP bodi…
RTP
Lab readyEnd-to-end media transport for audio/video: sequence numbers, timestamps, SSRC, and payload type. Usually over UDP; profile and format sp…
ICE
Lab readyInteractive Connectivity Establishment gathers local, reflexive, and relay candidates, then runs STUN checks to pick working media paths.…
WebRTC Signaling
Lab readyApplication-defined signaling — often SIP, or JSON over WebSocket — that exchanges SDP offers/answers and ICE candidates for WebRTC peers…
H.245
Lab readyH.323 multimedia control protocol for capability exchange, master/slave determination, and logical channel open/close. Fast Start and H.2…
SRTP
Lab readySecure RTP/RTCP with encryption and authentication, keyed from SDES, DTLS-SRTP, or MIKEY. A rollover counter (ROC) and key derivation pro…