2.2 Message Syntax

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SIP server discovery using DNS uses [RFC1035] and [RFC2782]. SIP server discovery using DHCP<2> uses [RFC3361]. The keep-alive protocol relies on the SIP message format, as specified in [RFC3261] section 7. All of the message syntax specified in this document is described in words and in Augmented Backus-Naur Form (ABNF), as defined in [RFC5234].