Polycom RealPresence 800s Administrator's Manual page 652

RealPresence Collaboration Server (RMX) 800s/Virtual Edition Administrator's Guide
Disconnection Cause
SIP not found
SIP redirection 300
SIP redirection 305
SIP redirection 380
SIP remote cancelled call
SIP remote closed call
SIP remote stopped responding
SIP remote unreachable
SIP request terminated
SIP request timeout
SIP server error 500
SIP server error 501
SIP server error 502
SIP server error 503
SIP server error 504
Polycom®, Inc.
Description
The endpoint was not found.
The server has definitive information that the user does not exist at the
domain specified in the Request-URI.
A SIP Redirection 300 (Multiple Choices) response was returned.
A SIP Redirection 305 (Use Proxy) response was returned.
The requested resource MUST be accessed through the proxy given
by the Contact field.
A SIP Redirection 380 (Alternative Service) response was returned.
The call was not successful, but alternative services are possible.
The endpoint canceled the call.
The endpoint ended the call.
The endpoint is not responding.
The endpoint could not be reached.
The endpoint terminated the request.
The request was terminated by a BYE or CANCEL request.
The request was timed out.
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.
The SIP server sent a SIP Server Error 501 (Not Implemented)
response.
The server does not support the functionality required to fulfill the
request.
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.
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.
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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