A SIP response is a message generated by a user agent server (UAS) or SIP server to reply a request generated by a client. It could be a formal acknowledgement to prevent retransmission of requests by a UAC.
1. A response may include some additional header fields of info needed by a UAC.
2. SIP has six responses.
3. 1xx to 5xx has been borrowed from HTTP and 6xx is introduced in SIP.
4. 1xx is considered as a provisional response and the rest are final responses.
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