SIP Response Codes

Three-digit response codes used in the Session Initiation Protocol (SIP). Modelled on HTTP status codes: 1xx provisional, 2xx success, 3xx redirection, 4xx client error, 5xx server error, 6xx global failure.

75 codes

• 100 Trying
• 180 Ringing
• 181 Call Is Being Forwarded
• 182 Queued
• 183 Session Progress
• 199 Early Dialog Terminated
• 200 OK
• 202 Accepted
• 204 No Notification
• 300 Multiple Choices
• 301 Moved Permanently
• 302 Moved Temporarily
• 305 Use Proxy
• 380 Alternative Service
• 400 Bad Request
• 401 Unauthorized
• 402 Payment Required
• 403 Forbidden
• 404 Not Found
• 405 Method Not Allowed
• 406 Not Acceptable
• 407 Proxy Authentication Required
• 408 Request Timeout
• 409 Conflict
• 410 Gone
• 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
• 421 Extension Required
• 422 Session Interval Too Small
• 423 Interval Too Brief
• 424 Bad Location Information
• 428 Use Identity Header
• 429 Provide Referrer Identity
• 430 Flow Failed
• 433 Anonymity Disallowed
• 436 Bad Identity-Info
• 437 Unsupported Certificate
• 438 Invalid Identity Header
• 439 First Hop Lacks Outbound Support
• 440 Max-Breadth Exceeded
• 469 Bad Info Package
• 470 Consent Needed
• 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
• 494 Security Agreement Required
• 500 Server Internal Error
• 501 Not Implemented
• 502 Bad Gateway
• 503 Service Unavailable
• 504 Server Time-out
• 505 Version Not Supported
• 513 Message Too Large
• 555 Push Notification Service Not Supported
• 580 Precondition Failure
• 600 Busy Everywhere
• 603 Decline
• 604 Does Not Exist Anywhere
• 606 Not Acceptable
• 607 Unwanted
• 608 Rejected