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Troubleshooting Guide for Cisco Unified Videoconferencing 3500 MCU Release 5.1
OL-12051-01
Chapter 1 Troubleshooting the Cisco Unified Videoconferencing 3500 MCU
Resolving Presentation Issues
Resolving Presentation Issues
This section describes what to do if you cannot start or receive a presentation during a conference.
Resolving Participant Connection Issues
This section describes what to do if you have difficulty connecting 96 participants in a conference even
though there are enough MVP resources available.
Resolving Unexpected SIP Call Disconnection
This section describes what to if a SIP call unexpectedly disconnects after 30 seconds.
Resolving Audio and Video Issues in SIP Calls
This section describes what to do if audio or video channels in SIP calls do not open.
Possible Causes Verification Steps
H.239 functionality is not enabled on your
endpoint.
• Verify that H.239 is enabled on the endpoint.
• Make a point-to-point call to another endpoint
and verify that you can start a presentation.
Presentation is not configured in the MCU service
used in your conference.
Configure the service to support presentation in
MCU > Services.
MCU presentation definitions in the service are
not supported by your endpoint (frame rate, frame
size, codec).
Check that your endpoint supports the frame size,
frame rate and video codec as defined in the
service.
Possible Causes Verification Steps
The MCU is configured to support DTMF
detection during the call.
Note DTMF detection reduces the number of
supported audio ports from 96 to 72.
Disable DTMF detection via the advanced
commands.
Possible Causes Verification Steps
DNS is not fully configured on the MCU and user
agents.
Verify that DNS is configured on user agent and
MCU.
Possible Causes Verification Steps
The MCU does not publish all its capabilities
when inviting other participants.
Check the Use Empty Invite when sending invite
messages to endpoints option in
MCU > Protocols > SIP > Advanced.
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