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3.1.5 Message Processing Events and Sequencing Rules

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All the message processing events and sequencing rules for media negotiation conform to the SDP specifications in [RFC4566] and [RFC3264], with some exceptions or modifications for the custom attributes introduced in this document.

Also note that the behavior described in [RFC4566] and [RFC3264] does not follow a simple client/server model. The two parties involved in an SDP exchange are peers. Which peer creates or modifies a session changes which peer is the offerer or answerer as specified in [RFC3264]. In addition, some SDP attributes follow an offer/answer behavior and some SDP attributes supply information to the other peer with no answer expected.