[Asterisk-Dev] FAX Subsystem discussion.

[Bruce Ferrell]

Over on openh323 is something called t38modem.  I know of someone who's 
using it as a soft modem

Jon Pounder wrote:
> 
> There was talk of this before, and my suggestion was just build a 
> virtual device driver for hylafax. Hylafax is the defacto standard in 
> faxing applications, and works with many faxmodem drivers. All we need 
> is a totally software faxmodem driver so hylafax thinks it is talking to 
> a real modem. The other side of the driver can talk to whatever 
> necessary on the asterisk side.
> 
> 
> At 09:58 AM 4/17/2003 -0500, you wrote:
> 
>> I have been thinking about the issues regarding transmitting faxs over 
>> VoIP
>> asterisk networks. I have a couple of ideas I want to toss around with 
>> you
>> guys. What I currently have in mind is fax client & server applications.
>> These would basically be the same but the server would be a tdm gateway -
>> where the faxes transmitted and received are handed off to the telco.
>>
>> The fax client would send and receive documents to local devices (fax
>> machines, network printers, email, PCs, etc. - but only the fax 
>> machines are
>> really necessary, as the server could do everything else) outgoing 
>> documents
>> would be queued until the entire document is received. The queued file 
>> would
>> then be sent to the server app where it would be transmitted out the tdm
>> gateway. Incoming documents would work in a similar manor.
>>
>> This strategy would be simpler than trying to get iax, echocans and 
>> delays
>> to work smoothly with fax traffic. Additionally, the image quality 
>> would be
>> better and the negotiated transmission rates would be maximized.
>>
>> We could probably find an existing fax server or rendering library, to
>> incorporate into the asterisk app, to do most of the work. It would 
>> have to
>> be lightweight so it didn't bog down the asterisk program. Would the 
>> use of
>> gpl code be OK for apps? A bit of notification code would need to be 
>> written
>> in addition to the app interface.
>>
>> Tips, suggestions, criticism or info on fax applications that would be
>> suitable for this purpose?
>>
>> John
>>
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> 
> 
> 
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