These instructions were provided by one of our customer.
1) follow the <a href=“http://www.didforsale.com/blog/?p=47″>same instructions</a> to setup a *SIP* trunk (not an IAX trunk)
2) in pbx web console, create an IAX extension. Make sure to – enter a secret. This secret will be used later on so make sure to enter it. – . . . → Read More: Setup FAX on Asterisk with DIDForSale SIP DIDs