Chapter 14. The Offer/Answer Model with SDP
The Session Description Protocol's (SDP) Offer/Answer Model is used by two entities to reach agreement on session description, such as which media streams are in the session, the codecs, etc. The offerer indicates the desired session description in the offer. The answerer replies to the offer by indicating the desired session description from the answerer's viewpoint. The Offer/Answer Model can be used to create sessions or to modify an existing session. There are, however, restrictions on what can appear in an offer and answer. The following sections describe how offers and answers are created. The Offer/Answer Model is described in more detail in [RFC3264].
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