SIP Response Codes

SIP Response Codes
SIP responses are the codes used by Session Initiation Protocol for communication. They complement the SIP Requests, which are used to initiate action such as a phone conversation. Note that the Reason Phrases of the responses listed below are only the recommended examples, and can be replaced with local equivalents without affecting the protocol. Contents 1 1xx—Informational Responses 2 2xx—Successful Responses 3 3xx—Redirection Responses 4 4xx—Client Failure Responses 5 5xx—Server Failure Responses 6 6xx—Global Failure Responses 7 External links 1xx—Informational Responses 100 Trying extended search being performed may take a significant time so a forking proxy must send a 100 Trying response 180 Ringing 181 Call Is Being Forwarded 182 Queued 183 Session Progress 2xx—Successful Responses 200 OK 202 accepted: It Indicates that the request has been understood but actually can't be processed 3xx—Redirection Responses 300 Multiple Choices 301 Moved Permanently 302 Moved Temporarily 305 Use Proxy 380 Alternative Service 4xx—Client Failure Responses 400 Bad Request 401 Unauthorized (Used only by registrars or user agents. Proxies should use proxy authorization 407) 402 Payment Required (Reserved for future use) 403 Forbidden 404 Not Found (User not found) 405 Method Not Allowed 406 Not Acceptable 407 Proxy Authentication Required 408 Request Timeout (Couldn't find the user in time) 409 Conflict 410 Gone (The user existed once, but is not available here any more.) 412 Conditional Request Failed 413 Request Entity Too Large 414 Request-URI Too Long 415 Unsupported Media Type 416 Unsupported URI Scheme 417 Unknown Resource-Priority 420 Bad Extension (Bad SIP Protocol Extension used, not understood by     the server) 421 Extension Required 422 Session Interval Too Small 423 Interval Too Brief 424 Bad Location Information 428 Use Identity Header 429 Provide Referrer Identity 433 Anonymity Disallowed 436 Bad Identity-Info 437 Unsupported Certificate 438 Invalid Identity Header 480 Temporarily Unavailable 481 Call/Transaction Does Not Exist 482 Loop Detected 483 Too Many Hops 484 Address Incomplete 485 Ambiguous 486 Busy Here 487 Request Terminated 488 Not Acceptable Here 489 Bad Event 491 Request Pending 493 Undecipherable (Could not decrypt S/MIME body part) 494 Security Agreement Required 5xx—Server Failure Responses 500 Server Internal Error 501 Not Implemented: The SIP request method is not implemented here 502 Bad Gateway 503 Service Unavailable 504 Server Time-out 505 Version Not Supported: The server does not support this version of     the SIP protocol 513 Message Too Large 580 Precondition Failure 6xx—Global Failure Responses 600 Busy Everywhere 603 Decline 604 Does Not Exist Anywhere 606 Not Acceptable External links Mapping SIP Error Messages to DSS1 codes Session Initiation Protocol (SIP) Parameters Contains a registry of different SIP parameters, including response codes