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Single most important tip for troubleshooting is inspect log files.
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To change the logging level, log into web ui, assuming you can access the web ui, and navigate menu to
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System/General
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And and you should see something like the following UI (there may be different components depending on how your system is installed and the version you are running)
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Setting the log level for a component to INFO will record all the SIP messages it sends and receives in the log. The DEBUG level is very verbose, and mostly of interest to software developers; INFO is sufficient for debugging most configuration problems.
How to debug a call
Once you change the log level, stop sipXpbx and move the existing log file aside, then restart sipXpbx so that you have a clean log. Make a call, then look at the log file
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syslogviewer -i < /var/log/sipxpbx/sipXproxy.log | less |
Make sure you set the log level back to NOTICE when done or your logs will take much more disk space. At high logging levels you may see a significant performance degradation when under high load.
For interpreting call flows, you can also Display SIP message flow using Sipviewer
Setting log level for Web UI - sipXconfig
By default sipXconfig is configured with NOTICE logging level. You can temporarily increase logging level by editing /etc/sipxpbx/sipxconfig-jetty.xml file.
Fine the following lines:
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<!- - set to true to enable sipxconfig logging --> |
and set debug to true
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<Set name="debug">true</Set> |
sipXconfig 3.4 Logging Level 
{{Box File|/etc/sipxpbx/log4j.properties|
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}}
Setting log level for mediaserver
Edit
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/etc/sipxpbx/voicemail.xml.in |
and change the
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voicemail-cgi-log-level |
XML element to this:
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<voicemail-cgi-log-level>DEBUG</voicemail-cgi-log-level> |
then restart mediaserver
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