Cisco Cisco TelePresence Video Communication Server Expressway
Check for errors
Check the Event Log which is accessible from the web browser:
Status > Logs > Event Log
.
Tracing calls
Tracing calls at SIP / H.323 level in VCS
1. Go to
Maintenance > Diagnostics > Diagnostic logging
.
2. Optionally, select Take tcpdump while logging.
3. Click Start new log.
4. (Optional) Enter some Marker text and click Add marker.
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The marker facility can be used to add comment text to the log file before certain activities are
performed. This helps to subsequently identify the relevant sections in the downloaded diagnostic log
file.
performed. This helps to subsequently identify the relevant sections in the downloaded diagnostic log
file.
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You can add as many markers as required, at any time while the diagnostic logging is in progress.
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Marker text is added to the log with a "DEBUG_MARKER" tag.
5. Reproduce the system issue you want to trace in the diagnostic log.
6. Click Stop logging.
7. Click Download log to save the diagnostic log archive to your local file system. You are prompted to save
the archive (the exact wording depends on your browser).
Call failures with Cisco TelePresence Server
SIP messages from Cisco TelePresence Server can be > 5,000 bytes (which is the default SIP Max
Incoming Message Size configured in Unified CM).
Incoming Message Size configured in Unified CM).
In-call problems
Calls clear down when a call transfer from a video phone on Unified CM
transfers a call to VCS
transfers a call to VCS
Even if use of a media termination point (MTP) is not requested on the SIP trunk between Unified CM and
VCS, if DTMF signaling method is configured as “No preference” on the SIP trunk on Unified CM, Unified CM
will try and use a Media Transfer Point and the call will fail.
VCS, if DTMF signaling method is configured as “No preference” on the SIP trunk on Unified CM, Unified CM
will try and use a Media Transfer Point and the call will fail.
To resolve this, ensure that DTMF signaling method is configured as RFC 2833 on Unified CM on the SIP
trunk from Unified CM to VCS.
trunk from Unified CM to VCS.
Failure to join a Unified CM endpoint to a conference using Multiway
.
Cisco Unified Communications Manager with Cisco VCS (SIP Trunk) Deployment Guide (X8.5)
Page 36 of 48
Appendix 1: Troubleshooting