[hylafax-users] Unreliable fax services via VoIP connection

[Lucas Barbuto <lucas@xxxxxxxxxx>]

Hi all,

My office is connected to the public phone network via a virtual PRI 
through our VoIP provider. I have two external modems connected to 
analogue ports on our PBX, both are used by Hylafax to receive incoming 
faxes. The software works exceptionally well in converting and 
dispatching messages, however, we have a lot of trouble receiving faxes.

The two modems are:

MODEM ROCKWELL RC288DPi/V3.210-V90_2M_DLS and MODEM USR U.S. Robotics 
Sportster Flash 56000 Rev. 10.1.31

Both modems appear to have recurring problems including (in order or 
popularity):

 * "T.30 T2 timeout, expected signal not received"
 * "Failed to properly detect high-speed data carrier."
 * "Failure to receive silence."
 * "T.30 T2 timeout, expected page not received"
 * "COMREC invalid response received (expected PPS)"

But most worryingly, some of our customers report that they are unable 
to connect to us at all, receiving "COMM. ERROR" and such messages on 
their fax machines.

Our provider suggests that we should provision analogue PSTN lines for 
faxing because fax via VoIP is never safe and rarely works well in their 
experience, but others in the business aren't satisfied with this answer.

Does anyone on the list have experience in this area? Should I 
definitely be looking at the VoIP link as the most likely culprit? Or 
somewhere else?

Regards,

--
Lucas

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