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Polycom, Inc. A-1
Appendix A
Disconnection Causes
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
IP Disconnection Causes
Table A-1 Call Disconnection Causes
Disconnection Cause Description
Disconnected by User The user disconnected the endpoint from the
conference.
Remote device did not open the
encryption signaling channel
The endpoint did not open the encryption signaling
channel.
Remote devices selected encryption
algorithm does not match the local
selected encryption algorithm
The encryption algorithm selected by the endpoint does
not match the MCU's encryption algorithm.
Resources deficiency Insufficient resources available.
Call close. Call closed by MCU The MCU disconnected the call.
H323 call close. No port left for audio Insufficient audio ports.
H323 call close. No port left for video The required video ports exceed the number of ports
allocated to video in fixed ports.
H323 call close. No port left for FECC The required data ports exceed the number of ports
allocated to data in fixed ports.
H323 call close. No control port left The required control ports exceed the number of ports
allocated to control data in fixed ports.
H323 call close. No port left for videocont The required video content ports exceed the number of
ports allocated to video content in fixed ports.