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Appendix A - Disconnection Causes
Polycom®, Inc. 633
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.
SIP server error 505 The SIP server sent a SIP Server Error 505 (Version Not Supported)
response.
The server does not support, or refuses to support, the SIP protocol
version that was used in the request.
SIP temporarily not available The participant's endpoint was contacted successfully but the
participant is currently unavailable (e.g., not logged in or logged in such
a manner as to preclude communication with the participant).
Disconnection Cause Description