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What is SIP Response Codes?

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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