Dave, I've been investigating a faxing solution also.
Hylafax (hylafax.org) is a very robust fax server and has been around forever I used to use it back in 1995 as a corporate network fax solution.
The solution I'm looking at implementing is a HylaFax server ( different box then the asterisk server so no CPU hit), configured with IAXModem ( http://iaxmodem.sourceforge.net/ ) and have asterisk forward all faxes to the HylaFax server extensions. Not sure how well it will scale, but according to the docs, you can have multiple instances of IAXmodem running and it runs fine if on a LAN. Now it is utilizing spandsp so I'm not sure how it will scale, but logic says if you can say only run 8 concurrent and you need to have 16 channels, then build a second box.
Just another option/approach. Mike Dave Donovan wrote:
Thanks Chuck, Your comments are consitent with what John says about scaling of SpanDSP. It seems that in your configuration, as you've indicated, much of the load was due to generation the images. It's useful in that my load would be at least that, plus the workload imposed by offloading the DSP from the fax boards onto the CPU. Hmmmm... Since I've already got the hardware and the PRI, maybe I'll setup spanDSP and test it. I'm sure I could count on 15 or so TAUG members to send me some test faxes and tie up the lines. If it runs, then great. If it crushes the box, then that's a valid result too and we'll walk away knowing a little bit more about asterisk and faxing. Additional info is still welcome and I'll be sure to keep you posted on my progress. Dave
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