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Collecting Debug Information for the Asterisk Issue Tracker

This document will provide instructions on how to collect debugging logs from an Asterisk machine, for the purpose of helping bug marshals troubleshoot an issue on

If Asterisk has crashed or deadlocked, see Getting a Backtrace.


Configure Asterisk logging

1. Edit the logger.conf file to enable specific logger channels to output to your filesystem. The word "debug_log_123456" can be changed to anything you want, as that is the filename the logging will be written to.

Modify the file name "debug_log_123456" to reflect your issue number.


debug_log_123456 => notice,warning,error,debug,verbose,dtmf

!!! tip Asterisk 13+ In Asterisk 13 and later, you can dynamically create log channels from the CLI using the logger add channel command. For example, to create the log file above, you would enter:

logger add channel debug_log_123456 notice,warning,error,debug,verbose,dtmf

The new log channel persists until Asterisk is restarted, the logger module is reloaded, or the log files are rotated. If using this CLI command, do not reload/restart/rotate the log files in Step 2.

Configure verbosity levels and rotate logs

2. From the Asterisk CLI, set the verbose and debug levels for logging (this affects CLI and log output) and then restart the logger module:

*CLI> core set verbose 5
*CLI> core set debug 5
*CLI> module reload logger

Optionally, if you've used this file to record data previously, then rotate the logs:

*CLI> logger rotate

Enable channel tech or feature specific debug

2.1. Depending on your issue and if a protocol level trace is requested, be sure to enable logging for the channel driver or other module.

Module (version) CLI Command
New PJSIP driver (12 or higher) pjsip set logger on
SIP (1.6.0 or higher) sip set debug on
SIP (1.4) sip set debug
IAX2 (1.6.0 or higher) iax2 set debug on
IAX2 (1.4) iax2 set debug
CDR engine cdr set debug on

Issue reproduction and clean up

3. Now that logging is configured, enabled and verbosity is turned up you should reproduce your issue.

4. Once finished, be sure to disable the extra debugging:

*CLI> core set verbose 0
*CLI> core set debug 0

4.1. Again, remember to disable any extra logging for channel drivers or features.

SIP (1.4 or higher)

*CLI> sip set debug off

IAX2 (1.4 or higher)

*CLI> iax2 set debug off

5. Disable logging to the filesystem. Edit the logger.conf file and comment out or delete the line you added in step 1. Using a semi-colon as the first character on the line will comment out the line.


;debug_log_123456 => notice,warning,error,debug,verbose,dtmf

Then reload the logger module (or restart Asterisk) as you did in step 2:

*CLI> module reload logger

Provide debug to the developers

6. Upload the file located in /var/log/asterisk/debug_log_123456 to the issue tracker.


  • Do NOT post the output of your file as a comment. This clutters the issue and will only result in your comment being deleted.
  • Attach the file with a .txt extension to make it easy for the developers to quickly open the file without downloading.