UpdatedPROPOSED STANDARDIETF stream

RFC 3264: An Offer/Answer Model with Session Description Protocol (SDP)

Still current, but amended. Parts of this document are changed or extended by RFC 6157, RFC 8843, RFC 9143. Read both.

In plain English — editorial summary, not part of the RFC

This document defines a mechanism by which two entities can make use of the Session Description Protocol (SDP) to arrive at a common view of a multimedia session between them. In the model, one participant offers the other a description of the desired session from their perspective, and the other participant answers with the desired session from their perspective. This offer/answer model is most useful in unicast sessions where information from both participants is needed for the complete view of the session. The offer/answer model is used by protocols like the Session Initiation Protocol (SIP). [STANDARDS-TRACK]

Document record

Document ID: RFC3264
Published: July 2002
Authors: J. Rosenberg; H. Schulzrinne
Status: PROPOSED STANDARD
Stream: IETF
Area: art
Pages: 25
Also known as: —

Obsoletes:: RFC 2543
Updated by:: RFC 6157, RFC 8843, RFC 9143

Topics

Standards lineage

This document is one revision in a chain of 7 RFCs, each formally replacing the one before it.

Read the full history of SIP-Specific Event Notification →

Referenced by

3 later RFCs formally update or obsolete part of this document.

Also filed under

About this page

The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

Last checked against the RFC Editor index on 23 August 2026. RFCs are never revised after publication; changes are issued as new documents.

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