[Asterisk-Dev] FAX Subsystem discussion.

[Chad Wicker]

What I am most interested in is a way to attach a fax to an Asterisk FXS
port and then connect through IAX (prefered) to another asterisk system
to connect to a T1 card for transmission to the PSTN.

Fax - FXS - * - WAN - * T1 - PSTN.

While direct conversion of the channel to a bitstream over IAX would be
nice, a store and forward would do in most cases.

This type of Fax capability (coupled with a good compression codec
v.729?) would alow me to take asterisk as a concept to asterisk as a
viable product.  

We provide Satellite service to the Energy sector and currently use
VoFR frads to provide 9.6k voice with VAD (also VAD would be nice) ti
provide voice and data services over a typical 64k satellite link.  With
equivilant compression on the voice and fax capabilities in this
bandwidth senario, I belive that I could add enough value to suplant our
current setup.

Chad C. Wicker
Systems Engineer
Petrocom

>>> JonP at inline.net 04/17/03 10:29AM >>>

Which sort of application are people most interested in ?

1) a private fax network where you control both ends of the system ?
2) a gateway in/out of your lan to the pstn for faxing ?

To me at least these are 2 totally different animals.

1) requires some sort of ip protocol and 2 foip endpoints
2) requires a software faxmodem driver for hylafax.

I think 1) is far simpler to solve than 2).

for 1), something as simple as the good old ftp protocol could be used
to 
exchange files of a predefined type (pdf, tiff, g3, etc) over an ip
channel 
between two drivers of hylafax. Using LCR algorithms in hylafax, this 
driver could be selected for communicating with other stations of the
same 
type. (this could be a store and forward setup as well, where the far
end 
foip station is not the final destination of the fax.)

for 2) we actually need the dsp stuff.



At 05:00 PM 4/17/2003 +0200, you wrote:
>At 16:21 17-4-2003 +0200, you wrote:
>>What system is Cisco using for Fax over their IP networks, and their
IP to
>>Analog gateway devices?
>>
>>I see that Cisco is using Skinny on their 48 port IP to Analog
Gateway.
>
>Skinny is just another dumb voip protocol which uses RTP streams for 
>audio. No specific fax-issues there...
>
>
>
>
>Met vriendelijke groet,
>Florian Overkamp
>ObSimRef BV (http://www.obsimref.com/)
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>Asterisk-Dev mailing list
>Asterisk-Dev at lists.digium.com 
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