[Asterisk-Users] Asterisk fax detection

[Zac Sprackett]

Hi,

I'm using an external SIP FXO gateway with Asterisk.  I've got a fax machine 
hooked up to an external SIP FXS.  I can currently send faxes through
asterisk.  I've been trying to get fax autodetection to work for inbound
pstn calls.

The relevant section of my extensions.conf is as follows:

[from-pstn]
exten => 8000,1,Macro(fixcid)
exten => 8000,2,Answer
exten => 8000,3,DigitTimeout(3)
exten => 8000,4,ResponseTimeout(10)
exten => 8000,5,BackGround(loligo/pls-wait-connect-call)
exten => i,1,Playback(pbx-invalid)
exten => i,2,Hangup
exten => t,1,Macro(rg-inbound,20)
exten => t,2,Goto(aa-nooneavail,s,1)
exten => fax,1,Dial(SIP/analog2,,d)
exten => fax,2,Hangup

Fax calls come in and after the 10 second timeout ring through to the voice
sets.  I don't see anything in either debug or messages that suggests that
asterisk is detecting the fax tones.  Has anyone successfully gotten this 
to work using anything other than the Zaptel cards?

Does anyone have any suggestions as to what else I could look at?  I've tried
sending faxes from more than one machine with the same results.  If I dial 
the FXS extension connected to the fax machine the fax goes through 
successfully.

Thanks
-z