423 Interval Too BriefĮxpiration time of the resource is too short. The received request contains a Session-Expires header field with a duration below the minimum timer. The server needs a specific extension not listed in the Supported header. 420 Bad Extensionīad SIP Protocol Extension used, not understood by the server. There was a resource-priority option tag, but no Resource-Priority header. The server is refusing to service the request because the Request-URI is longer than the server is willing to interpret. Deprecated by omission from later RFCs and by non-registration with the IANA. The server will not accept the request without a valid Content-Length. The user existed once, but is not available here any more. The client MAY repeat the request without modifications at any later time. The server could not produce a response within a suitable amount of time, for example, if it could not determine the location of the user in time. 408 Request TimeoutĬouldn't find the user in time. The request requires user authentication. The resource identified by the request is only capable of generating response entities that have content characteristics but not acceptable according to the Accept header field sent in the request. The method specified in the Request-Line is understood, but not allowed for the address identified by the Request-URI. This status is also returned if the domain in the Request-URI does not match any of the domains handled by the recipient of the request. The server has definitive information that the user does not exist at the domain specified in the Request-URI. Sometimes (but not always) this means the call has been rejected by the receiver. The server understood the request, but is refusing to fulfill it. This response is issued by UASs and registrars. The request could not be understood due to malformed syntax. 4xx-Client Failure Responses 400 Bad Request The call failed, but alternatives are detailed in the message body. The Contact field details a proxy that must be used to access the requested destination. If an Expires field is present, the client may cache the result for that period of time 305 Use Proxy The client should try at the address in the Contact field. The original Request-URI is no longer valid, the new address is given in the Contact header field, and the client should update any records of the original Request-URI with the new value. The address resolved to one of several options for the user or client to choose between, which are listed in the message body or the message's Contact fields. 3xx-Redirection Responses 300 Multiple Choices Indicates the request was successful, but the corresponding response will not be received. Indicates that the request has been accepted for processing, but the processing has not been completed. 199 Early Dialog TerminatedĬan be used by User Agent Server to indicate to upstream SIP entities (including the User Agent Client (UAC)) that an early dialog has been terminated. This response may be used to send extra information for a call which is still being set up. A server may send multiple 182 responses to update progress of the queue. Indicates that the destination was temporarily unavailable, so the server has queued the call until the destination is available. Servers can optionally send this response to indicate a call is being forwarded. 180 Ringingĭestination user agent received INVITE, and is alerting user of call. InstructionsĮxtended search being performed that may take a significant time so a forking proxy must send a 100 Trying response. This article gives you an overview of all response codes for troubleshooting. SIP - Session Initiation Protocol - is a protocol developed by the IETF MMUSIC Working Group that is used to set up, hold and terminate communication sessions. These sessions may include, but are not limited to, telephone conversations including multimedia streaming, instant messaging, virtual reality scenarios, and for playing online computer games.
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