Cisco Cisco 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 Expressway
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.
—
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.
helps to subsequently identify the relevant sections in the downloaded diagnostic log file.
—
You can add as many markers as required, at any time while the diagnostic logging is in progress.
—
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).
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).
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
Expressway
Expressway
Even if use of a media termination point (MTP) is not requested on the SIP trunk between Unified CM and Expressway, 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.
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 Expressway.
Poor Video Quality from Unified CM
Ensure that your Unified CM region has an appropriate session bit rate for video calls as described in
.
Taking a Trace on Unified CM Using RTMT
RTMT is a tool that lets you monitor system health, view graphs and collect logs from Unified CM. There are versions for
both Linux and Windows. Unified CM must also be configured to specify what can be traced.
both Linux and Windows. Unified CM must also be configured to specify what can be traced.
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Cisco Expressway SIP Trunk to Unified CM Deployment Guide