I have an Asterisk box with a Atcom AX400 card in it with an FXO module. All incoming calls come to the line on the trunk card and then if that line is busy they step to some SIP trunks.

This line has just been enabled with faxability and is causing some issues for me. I think I have a small clue how to go about fixing this but just wanted some gurus to have a look over it first.

I think I need to add something in to dahdi-channels.conf so that it looks at the ringing cadence and then sends them to appropriate contexts. What I will do is send the normal ring to the zaptel context to give it a DDI and then the distinct ring will go to a context that goes no where until such a time the fax answers.

I know there is 'usedistinctiveringdetection' but don't really know what to put with it to make it here the rings.

Any help much appreciated.