[Asterisk-Dev] FAX Subsystem discussion.

[Jon Pounder]

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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