SOLVED pbx giving fax tones on incoming voice calls

[loonsailor]

Sometimes, incoming voice calls to my piaf system receive a fax tone. This happens only on a dahdi line, coming in to a Sangoma card. When it happens, the expected phones ring, but when I pick one up it's a dead line. The caller reports hearing only a fax tone.

There is a fax that comes off of an fxs line from the same Sangoma card, but it's on a separate ring group, so I don't think that's the problem.

Poking around, I find that the file asterisk/chan_dahdi.conf contains the following lines for each channel:

context=from-zaptel
group=0
echocancel=yes
faxdetect=incoming
signalling = fxs_ks
channel => 1

Could the faxdetect line be the problem? Could the card be spuriously detecting a fax on the incoming call, and generating the fax tone itself, or triggering something in piaf that generates it? I'd try and change it, but the file also admonishes:

;autogenerated by /usr/sbin/wancfg_dahdi do not hand edit
;autogenrated on 2011-07-22

I don't remember ever running wancfg_dahdi, but in the scramble to get things up, perhaps I did. What I do remember is that I had a hard time getting the dahdi trunk to work right, so I don't want to mess with it and re-break it.

So, should I edit the file, or re-run wancfg, or is there some way to fix it from freepbx, or am I barking up the wrong tree completely?

Also, I note that the card's FXS channel also has faxdetect=incoming. I do have a fax machine connected to that fxs. I don't think it's been a problem, but should I change that?

The card is a Sangoma B600DE - 4 FXO + 1 FXS Port - PCI Express - With Hardware Echo .

Thanks for any help!

 

[loonsailor]

So, I shouldn't worry about it being auto-generated again and regressing back to "incoming"? Is the autoconfig only run manually, or is there something else that might trigger it to be regenerated?

 

[atsak]

So, I shouldn't worry about it being auto-generated again and regressing back to "incoming"? Is the autoconfig only run manually, or is there something else that might trigger it to be regenerated?

Even with autodetect=no you might still hear the fax tones. I have an end user with the identical issue and have never been able to solve it, but it's very rare.

In their case the fax line isn't even plugged into the system.

 

[Appleton6509]

ahh i get this issue aswell. It happens when i call the number, hang up, and then call the number immediately back........ i also do not have a fax line connected

 

[Appleton6509]

hmm i turned fax detection off and it saved and it didnt work. then i set my opermode to canada and now i cant replicate the issue. It appears to be fixed now... fine by me!

 

[atsak]

hmm i turned fax detection off and it saved and it didnt work. then i set my opermode to canada and now i cant replicate the issue. It appears to be fixed now... fine by me!

Opermode? Where is that set?

 

[Appleton6509]

ahhhh dont bother i guess i jumped the gun. i tried it again later... fax tones upon 2nd call immediately.