Fax over IP?

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Asterisk Users 3 Comments

Hi Tim,

Thanks for your response. Here is my topology as listing down below;

PSTN Line –> Cisco Voice GW –> IP Cloud –> Asterisk

Will Asterisk able to receive the fax (as in topology above) using its’ fax
module? In sip.conf I enabled fax detection and T.38. Actually I don’t
want
to use Hylafax + iaxmodem as per requirement.

Please advice.

> Date: Fri, 1 Jun 2012 10:19:12 -0400
> From: Ahmed Munir
> Subject: [asterisk-users] Fax over IP ?
> To: asterisk-users@lists.digium.com
> Message-ID:
> > >
> Content-Type: text/plain; charset=”iso-8859-1″
>
> Hi all,
>
> Couple of things I would like ask, does Asterisk provides free license for
> FoIP (for 1 channel) or need to purchase it? Couple of years back, I was
> able to send and receive the fax using Digium T1 card, in term of FoIP how
> can I able to receive fax from traditional telephone lines / T1 lines? As
> far my understanding, the functionality for FoIP is to send fax to email or
> receive fax from email i.e. using T.38 protocol.
>
> The thing I would like to know how I can implement this solution i.e.
> receiving fax via IP? Correct me if I’m wrong, while receiving fax from
> traditional telephone lines will the topology looks like as listed below;
>
> PSTN Lines –> Asterisk (mounted a T1/ analog card) –> IP –> Asterisk
> (receive Fax over IP)
>
> or else?
>
> Please advice.
>
>
> —
> Regards,
>
> Ahmed Munir Chohan
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> Message: 15
> Date: Fri, 1 Jun 2012 09:29:19 -0500 (CDT)
> From: Tim Nelson
> Subject: Re: [asterisk-users] Fax over IP ?
> To: Asterisk Users Mailing List – Non-Commercial Discussion
>
> Message-ID: <2939915.57880.1338560959074.JavaMail.root@rockbochs.com>
> Content-Type: text/plain; charset=utf-8
>
> —– Original Message —–
> > Hi all,
> > Couple of things I would like ask, does Asterisk provides free
> > license for FoIP (for 1 channel) or need to purchase it? Couple of
> > years back, I was able to send and receive the fax using Digium T1
> > card, in term of FoIP how can I able to receive fax from traditional
> > telephone lines / T1 lines? As far my understanding, the
> > functionality for FoIP is to send fax to email or receive fax from
> > email i.e. using T.38 protocol.
> > The thing I would like to know how I can implement this solution i.e.
> > receiving fax via IP? Correct me if I’m wrong, while receiving fax
> > from traditional telephone lines will the topology looks like as
> > listed below;
> > PSTN Lines –> Asterisk (mounted a T1/ analog card) –> IP –>
> > Asterisk (receive Fax over IP)
> > or else?
>
> FoIP typically means the fax session traverses an IP link at some point,
> most commonly at the ‘last mile’. What happens to the fax after that is up
> to your requirements. The faxes can be emailed out, stored in a web
> application, printed to a printer, etc. The possibilities are endless.
>
> Asterisk does have a few options for faxing. Those are most notably:
>
> 1. Fax for Asterisk – Free license available for 1 channel, or paid
> licenses for 2+ channels
> 2. app_fax (I think this is the current module name) – Free fax module for
> Asterisk, no channel limit, based on SpanDSP
> 3. Hylafax+ and IAXmodem – Most complicated method of fax setup, but most
> robust and reliable (in my testing). Would require use of Asterisk 10 with
> T.38 gateway functionality for proper fax reception.
>
> Just keep in mind raw fax audio over VoIP is a bad idea, see here:
> http://www.soft-switch.org/foip.html
>
> If you can provide some additional details on what you’re planning to do,
> we can give more info.
>
> –Tim
>
>
>
> ——————————
>
> Message: 16
> Date: Fri, 1 Jun 2012 09:36:50 -0500 (CDT)
> From: Tim Nelson
> Subject: Re: [asterisk-users] Fax Server for Asterisk
> To: Asterisk Users Mailing List – Non-Commercial Discussion
>
> Message-ID: <13867195.58161.1338561410617.JavaMail.root@rockbochs.com>
> Content-Type: text/plain; charset=utf-8
>
> —– Original Message —–
> > Hi Tim,
> > Unfortunately i can’t reproduce the scenario because it was a long
> > time ago. But it would be nice to hear from you, what things can be
> > verified within fax and Asterisk? Any TIP on wireshark monitoring?
>
> Within Asterisk, the debug logs can be helpful for routing/connectivity
> diagnostics. With Hylafax, all of your details will be found in the session
> logs in /var/spool/hylafax/log. Here you can see each session’s interaction
> with the remote fax device. It is an art deciphering the various protocols,
> but the folks on the Hylafax lists are incredibly helpful until you’ve
> learned the magic of understanding the logs directly. 🙂
>
> –Tim
>

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