Polycom RealPresence RMX 1500 Administrator's Manual page 924

Call Disconnection Causes
Disconnection Cause
H323 call closed. Remote stop
responding
H323 call closed. Master slave problem
SIP bad name
SIP bad status
SIP busy everywhere
SIP busy here
SIP capabilities don't match
SIP card rejected channels
SIP client error 400
SIP client error 402
SIP client error 405
SIP client error 406
SIP client error 407
SIP client error 409
SIP client error 411
Polycom®, Inc.
Description
The endpoint stopped responding.
A People + Content cascading failure occurred.
The conference name is incompatible with SIP standards.
A general IP card error occurred.
The participant's endpoints were contacted successfully, but the
participant is busy and does not wish to take the call at this time.
The participant's endpoint was contacted successfully, but the
participant is currently not willing or able to take additional calls.
The remote device capabilities are not compatible with the conference
settings.
The IP card could not open the media channels.
The endpoint sent a SIP Client Error 400 (Bad Request) response.
The request could not be understood due to malformed syntax.
The endpoint sent a SIP Client Error 402 (Payment Required)
response.
The endpoint sent a SIP Client Error 405 (Method Not Allowed)
response.
The method specified in the Request-Line is understood, but not
allowed for the address identified by the Request-URI.
The endpoint sent a SIP Client Error 406 (Not Acceptable) resources.
The remote endpoint cannot accept the call because it does not have
the necessary responses. The resource identified by the request is
only capable of generating response entities that have content
characteristics not acceptable according to the Accept header field
sent in the request.
The endpoint sent a SIP Client Error 407 (Proxy Authentication
Required) response.
The client must first authenticate itself with the proxy.
The endpoint sent a SIP Client Error 409 (Conflict) response.
The request could not be completed due to a conflict with the current
state of the resource.
The endpoint sent a SIP Client Error 411 (Length Required) response.
The server refuses to accept the request without a defined Content
Length.
Appendix A - Disconnection Causes
893