Polycom RMX 1500 Administrator's Manual page 833

Disconnection Causes
IP Disconnection Causes.
Appendix A
If a participant was unable to connect to a conference or was
disconnected from a conference, the Connection Status tab in the
Participant Properties dialog box indicates the call disconnection cause. In
some cases, a possible solution may be displayed.
A video participant who is unable to connect the video channels, but is
able to connect as an audio only participant, is referred to as a Secondary
participant. For Secondary participants, the Connection Status tab in the
Participant Properties dialog box indicates the video disconnection cause.
In some cases, a possible solution may be indicated.
The table below lists the call disconnection causes that can be displayed
in the Call Disconnection Cause field and provides an explanation of
each message
Table A-1 Call Disconnection Causes
Disconnection Cause
Disconnected by User
Remote device did not
open the encryption
signaling channel
Remote devices selected
encryption algorithm does
not match the local
selected encryption
algorithm
Description
The user disconnected the endpoint from the
conference.
The endpoint did not open the encryption
signaling channel.
The encryption algorithm selected by the
endpoint does not match the MCU's encryption
algorithm.
A-1