Cisco Systems RFC 2543 and RFC 3261 appendix Table A-3 SIP Responses

Appendix A SIP Compliance

RFC 2543 and RFC 3261

Table A-3 SIP Responses (continued)

SIP Response

Meaning

Supported?

Cisco SPS Action

4xx Response—Request Failure Responses
400	Bad Request	Request can not be understood because	Yes	Generates and forwards this
		of an illegal format.		response.
401	Unauthorized	Request requires user authentication.	Yes	Forwards this response. If it is
				configured as a registrar and
				authentication is enabled,
				generates this response.
402	Payment required	Payment is required for server to	See Cisco SPS	In registrar mode and if proxied
		complete the call.	action	by the proxy server, generates
				this response.
403	Forbidden	Server has received and understood the
		request but will not provide the service.
404	Not found	Server has definite information that the	Yes	Generates and forwards this
		user does not exist in the specified		response.
		domain.
405	Method not allowed	Method specified in the request is not	See Cisco SPS	Forwards this response.
		allowed. The response contains a list of	action
		allowed methods.
406	Not acceptable	Requested resource can generate only
		responses that have unacceptable
		content as specified in the accept header
		of the request.
407	Proxy authentication	Similar to the 401 Unauthorized	Yes	Forwards this response. If
	required	response, but client must first		authentication is enabled,
		authenticate itself with the proxy.		generates this response.
408	Request timeout	Server could not produce a response	See Cisco SPS	Generates and forwards this
		before the expiration timeout.	action	response.
409	Conflict	Request cannot be processed because of
		a conflict with the current state of the
		resource.
410	Gone	A resource is no longer available at the	See Cisco SPS	Forwards this response.
		server and no forwarding address is	action
		known.
411	Length required	User refuses to accept the request	Yes
		without a defined content length.
413	Request entity too large	Server refuses to process the request	See Cisco SPS
		because it is larger than the server is	action
		willing or able to process. If a retry after
		header field is contained in this
		response, the user can attempt the call
		once again in the retry time provided.
414	Request-URI too long	Server refuses to process the request	Yes	Generates and forwards this
		because the Request-URI is too long for		response.
		the server to interpret.

Cisco SIP Proxy Server Administrator Guide

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