2.2 Message Syntax

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This protocol relies on the SIP message format, as specified in [RFC3261] section 7, and extends definitions of URI and header field parameters by adding new values for parameter and header field names, as well as their corresponding values. This protocol defines new message body types in addition to those defined in [RFC3261]. All of the message syntax specified in this protocol is described in both prose and an Augmented Backus-Naur Form (ABNF), as defined in [RFC5234].