Protocols BroadNet answer

What is SDP (Session Description Protocol)?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

SDP (Session Description Protocol, RFC 8866) is the text format that describes a media session — which codecs, IP addresses, ports, and parameters each side will use. It is not a transport itself; it rides inside SIP (or WebRTC) as an offer/answer exchange, so the two endpoints agree on how to send RTP before the media flows. Codec negotiation and NAT candidate exchange both happen in SDP. See /answers/what-is-sip, /answers/what-is-voice-codec, and /answers/what-is-webrtc.

Plain-language definitionVendor-neutralReviewed July 22, 2026

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