[asterisk-users] DAHDI fax detection

Ryan, Travis RyanT at OscarWinski.com
Tue Dec 11 08:43:54 CST 2018

Yes it's very easy. Mine is using a simulated PRI over an ATT Flex line. I just followed the many tutorials out there. I answer the call, then it takes 6-7 seconds (you can add a wait if you want) and then it detects it and drops it to the fax extension in the same context. 

Also, until recently I used the Asterisk Fax licensing, but have since switched to spandsp as that is the supported one ongoing.

-----Original Message-----
From: asterisk-users <asterisk-users-bounces at lists.digium.com> On Behalf Of Mitch Claborn
Sent: Tuesday, December 11, 2018 9:41 AM
To: asterisk-users at lists.digium.com
Subject: Re: [asterisk-users] DAHDI fax detection

I'm assuming that no one knows the answer to this.

Does anyone have fax detection successfully working? If so, can you share your configuration?


On 12/4/18 4:27 PM, Mitch Claborn wrote:
> Asterisk 16 latest
> DAHDI 3.0.0 latest
> Excerpt from chan_dahdi.conf is shown below.  I'm trying to enable fax 
> detection on inbound calls so that I can take appropriate action in the 
> dial plan.  "dahdi show channel 1" shows "Fax Handled: no". Does that 
> mean that I don't have it configured correctly?
> [channels]
> ; Span 1: WCTE2/0/1 "WCTE23X (PCI) Card 0 Span 1" (MASTER) ESF/B8ZS RED
> group=10,11
> context=from-pstn
> switchtype = national
> signalling = pri_cpe
> faxdetect=incoming
> faxdetect_timeout=0
> faxbuffers => 12,half
> channel => 1-23
> ; Span 2: WCTE2/0/2 "WCTE23X (PCI) Card 0 Span 2" ESF/B8ZS RED
> group=10,12
> context=from-pstn
> switchtype = national
> signalling = pri_cpe
> channel => 25-47

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