DAHDI Fax Detection

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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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Mitch

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3 thoughts on - 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?

    Mitch

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  • 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.

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