Callum McGillivray wrote:
Haha - My director wants to do away with the analogue line that we have
for our fax machine at the moment !! I really don't want a whole PBX
sitting around just to handle a single fax machine....
Thanks for the info / experience though....
Has anyone else got any other experiences with this kind of stuff ?
The bottom line is that analog modem signals have to be accurately
reproduced through the system with no fluctuations in timing (eg,
jitter). That generally translates into pci bus quality, interrupts
being handled accurately with no delays, clean ethernet infrastructure, etc.
Bringing fax analog signals into the system via a digital facility (eg,
PRI) is well supported throughout the industry. However, when the PRI
packet content is shipped across the pci bus, handled by asterisk, and
sent to another device (eg, sip adapter), the success/failure is highly
dependent upon exactly what/how your system is configured. If your
motherboard has a poor pci implementation, or if you didn't address
interrupt sharing, or if your ethernet infrastructure has issues, or if
your asterisk system has other applications running that consume cycles,
faxing will be less then reliable.
In the pure analog pstn world, the only reliable way to handle faxes
within asterisk is to use an analog pstn card that switches packets from
an fxo port to an fxs port (fax machine) on the same card. The sangoma
A200D works fine. The digium TDM2400 card just had a patch applied in
the last couple of weeks to do this as well. (I've not yet tested the
TDM2400 to actually see if that works though.)
In the pure digital pstn world, others have reported success with:
- channel bank(s) with an attached fax machine
- some sip adapters (with a solid network infrastructure)
- combination of iaxmodem and hylafax
Pick one and see if it works in your environment.
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