Comments
Some of these are
500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Time-out
505 SIP Version not supported
Posted by HamidAliKhan
Ans) 5xx SIP response message are server error responses:
500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Time-out
505 SIP Version not supported
Posted by Franklin