SIP Responses
From VoIP.ms Wiki
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.
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Informational Responses - 1xx
- 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
Successful Responses - 2xx
- 200 OK
- 202 accepted: It Indicates that the request has been understood but actually can't be processed
- 204 No Notification [RFC5839]
Redirection Responses - 3xx
- 300 Multiple Choices
- 301 Moved Permanently
- 302 Moved Temporarily
- 305 Use Proxy
- 380 Alternative Service
Client Failure Responses - 4xx
- 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
Server Failure Responses - 5xx
- 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
Global Failure Responses - 6xx
- 600 Busy Everywhere
- 603 Decline
- 604 Does Not Exist Anywhere
- 606 Not Acceptable
Siemens 7xx-Extended Codes
Attention: The following is a list of SIP Codes belonging to the 7xx, 8xx, 9xx classes (applicative) and used by Siemens in their Gigaset products. They are not documented by any SIP RFC and other companies and applications may override them without notice.
- 701 The called party has hung up
- 702 VoIP socket error
- 703 Connection cancelled because of timeout
- 704 Connection interrupted because of a SIP error
- 705 SIP memory error
- 706 SIP transaction memory error
- 751 Busy tone: No codec match between the calling and called party
- 810 General socket layer error.
- 811 General socket layer error: Wrong socket number
- 812 General socket layer error: Socket is not connected.
- 813 General socket layer error: Memory error
- 814 General socket layer error: Socket not available – check IP settings/connection problem/VoIP setting incorrect
- 815 General socket layer error: Illegal application on the socket interface
- 922 No DNS server known
- 923 DNS name resolution failed
- 924 Insufficient resources for DNS name resolution
- 925 URL error
