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[hylafax-users] Unreliable fax services via VoIP connection
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
* "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
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