Polycom RMX 1500 Administrator's Manual page 857

Table A-1 Call Disconnection Causes (Continued)
Disconnection Cause
SIP transport error
SIP unauthorized
SIP unsupported media
type
Polycom RMX 1500/2000/4000 Administrator's Guide
Description
Unable to initiate connection with the endpoint.
The request requires user authentication.
The server is refusing to service the request
because the message body of the request is in a
format not supported by the requested resource
for the requested method.
A-9