Re: [hylafax-users] Faxing over VOIP?

[A J Stiles <hylafax_resp@xxxxxxxxxxxxxxx>]

On Thursday 09 November 2006 23:50, you wrote:
> Does anyone have any experience with Hylafax on top of a VOIP line?
>
> I've been testing this succesfully with one line. i.e. take the output
> of one of the modems in hylafax, connect it to a VOIP adapter, and it
> works fine (faxes succesfully transmit).
>
> I understand that the proper method for doing this is FOIP and uses
> different protocol than VOIP. So anyone using true FOIP in conjunction
> with Hylafax, I'd certainly be interested in hearing about your setup
> too.
>
> The next stage I want to test is 8 simultaneous fax over VOIP lines, and
> I'm wondering if any solutions exists to do this without all the
> hardware layers. i.e. currently it's hylafax->faxboard->voip
> adapter->internet. Is there any way to go hylafax->internet direct?

We have  had reasonable results with connecting ordinary analogue fax machines 
in individual offices through Asterisk using Grandstream HandyTone adaptors.  
These, however, are just for "secondary" use; the Hylafax server we use for 
most of our faxes has an Eicon Diva card, which is plumbed through a Digium 
4-port card in our Asterisk server to an ISDN primary rate line.

Still, this "solution" involves a d-to-a and an a-to-d conversion, which by 
any reckoning has *got* to be sub-optimal.  I don't see any reason why it 
shouldn't be possible to translate the zeros and ones of a FAX  (which the 
modem would ordinarily turn into a series of rather unmusical sounds)  
directly into the zeros and ones of a VoIP call  (which actually represent 
those sounds),  without passing through any analogue circuitry at any stage.

I *think* this is precisely what IAXModem is meant to do.

--
AJS

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