[asterisk-users] Problem with detecting fax on PRI/DAHDI channels

[Sawan Vithlani]

Many thanks for this.

Where would I be able to get NVFaxDetect for Asterisk 1.8?

Can you recommend a decent add-on ?

Sawan

On Fri, Jun 24, 2011 at 1:41 AM, Kevin P. Fleming <kpfleming at digium.com> wrote:
> On 06/23/2011 09:12 AM, Sawan Vithlani wrote:
>>
>> Hello all,
>>
>> I am using  call files to dial out to a set of PSTN numbers. The calls
>> are going out fine and being handled correctly by the dial plan.
>>
>> The problem occurs when I accidentally call a fax machine. I would
>> expect the dial plan to pick this up and jump to the "fax" extension
>> in the current context. This is not happening.
>>
>> In the call file I send the call out via Dial(DAHDI/g0/XXXXXXXX) and
>> then it goes to my dial plan context:
>>
>> [SendCall]
>> exten =>  start,1,Answer()
>>    same =>  n, Wait(5)
>>    same =>  n, ..... ;; do some more stuff
>>
>> exten =>  fax,1,Verbose(got a Fax on ${EXTEN})
>> same =>n, Hangup()
>>
>> ;;;;
>>
>>  I do get a message on the CLI telling me "Channel 63 detected a CED
>> tone from the network" but still no jumping to the fax extension.
>> This is while dialplan is in the Wait(5).
>>
>> CLI>  core show version
>> Asterisk 1.8.4.1-1digium1~natty built by pbuilder @ nighthawk on a
>> x86_64 running Linux on 2011-05-23 22:05:17 UTC
>>
>> ISDN lines connected via Digium TE412P card.
>>
>> I have "faxdetect = both" in chan_dahdi.conf in the general section as
>> well as specifically for the configured spans.
>
> 'faxdetect' is for detecting *calling* FAX machines, not *called* FAX
> machines. It listens for the CNG tone generated by a (non-V.34) calling FAX
> terminal.
>
> If you are wanting to detect that a number you have dialed is being answered
> by a FAX machine, there are applications available (but not included with
> Asterisk) to do that. I believe NVFaxDetect can do it, and most of the
> add-on answering machine detection applications can do it as well.
>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at www.digium.com & www.asterisk.org
>
> --
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