Polycom 1500/1800/2000/4000 manual Request

Appendix A - Disconnection Causes

Call Disconnection Causes

Disconnection Cause	Description
SIP not found	The endpoint was not found.
	The server has definitive information that the user does not exist at the
	domain specified in the Request-URI.
SIP redirection 300	A SIP Redirection 300 (Multiple Choices) response was returned.
SIP redirection 305	A SIP Redirection 305 (Use Proxy) response was returned.
	The requested resource MUST be accessed through the proxy given
	by the Contact field.
SIP redirection 380	A SIP Redirection 380 (Alternative Service) response was returned.
	The call was not successful, but alternative services are possible.
SIP remote cancelled call	The endpoint canceled the call.
SIP remote closed call	The endpoint ended the call.
SIP remote stopped responding	The endpoint is not responding.
SIP remote unreachable	The endpoint could not be reached.
SIP request terminated	The endpoint terminated the request.
	The request was terminated by a BYE or CANCEL request.
SIP request timeout	The request was timed out.
SIP server error 500	The SIP server sent a SIP Server Error 500 (Server Internal Error)
	response.
	The server encountered an unexpected condition that prevented it from
	fulfilling the request.
SIP server error 501	The SIP server sent a SIP Server Error 501 (Not Implemented)
	response.
	The server does not support the functionality required to fulfill the
	request.
SIP server error 502	The SIP server sent a SIP Server Error 502 (Bad Gateway) response.
	The server, while acting as a gateway or proxy, received an invalid
	response from the downstream server it accessed in attempting to fulfill
	the request.
SIP server error 503	The SIP server sent a SIP Server Error 503 (Service Unavailable)
	response.
	The server is temporarily unable to process the request due to a
	temporary overloading or maintenance of the server.
SIP server error 504	The SIP server sent a SIP Server Error 504 (Server Time-out)
	response.
	The server did not receive a timely response from an external server it
	accessed in attempting to process the request.

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