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SIP Protocol - Coggle Diagram
SIP Protocol
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SIP Messages
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Responses: distinguised by having a Status-Line as their start-line. Status-Line consists of the protocol version followed by a numeric Status-Code and its associated textual phrase:
1xx: Provisional -- request received, continuing to process request
2xx: Success -- the action was successfully recieved, understood and accepted
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UAC
UAC messages at a minimum, contain the following header fields: to, From, CSeq, Call-ID, Max-forwards and Via.
All of these header fields are mandatory in all SIP requests.
Request-URI: SHOULD be set to the value of the URI in the To field, except for the REGISTER method.