Asterisk upgrade breaks IAX extensions
If you have upgraded your version of Asterisk and find that your IAX2 extensions no longer work then the cause could be a change to the IAX protocol. This was made to resolve a security issue that could result in a denial of service attack.
You will see this error in the Asterisk log file if you are suffering from this issue -
If you use FreePBX then Asterisk can be made to function the same as before by adding the following 2 lines to /etc/asterisk/iax_general_custom.conf -
maxcallnumbers = 16382
You will also need to do a -
or restart Asterisk for the changes to take effect.
More information about the reason for this change and the implications for disabling call token checking can be found here –
http://svn.digium.com/svn/asterisk/branches/1.6.0/doc/IAX2-security.pdf
Related posts:
- Integrating FreePBX with A2Billing
- Asterisk/FreePBX dial plan injection vulnerability
- FBI / IC3 issue warning for Asterisk users
Frode:
When implementing the workaround as mentioned above, and in the original Digium document, connections to external IAX trunks (such as Les.net) stop working. In addition, an internal S100-FX IAX analog converter is still unable to connect to * after this change has been performed.
3 October 2009, 8:27 pm