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Re: [hylafax-users] COMREC invalid response received PSTN <--> Asterisk <--> Hylafax
Can somebody point me in a right direction.
I'm running Hylafax with Asterisk:
PSTN <--> Asterisk <--> Hylafax
I'm using an external "MultiTech Modem"
Sending faxes works flawlessly, though receiving faxes works 90% of the
You're going to have lots of trouble with this configuration because to
accomplish this configuration you're either using a TDM card and
connecting the modem to that, or you're connecting the modem to an ATA
device (such as a Sipura SP-2000). The TDM card drivers have known
problems for faxing, and in using an ATA device you're converting the
fax audio stream to a VoIP stream, and you can run into problems that way.
That said, I sometimes test HylaFAX with an analog modem connected to an
ATA, and generally speaking it works tolerably well, but there are far
more errors with it than if I were to plug the modem directly into a
Your best chance for success this way would be to use latest HylaFAX CVS
HEAD and to switch to Class 1.
The other option with Asterisk, currently, to get reliable faxing is to
ensure that the PSTN line is digital and that Asterisk never converts it
to an analog signal. So the PSTN line needs to be T1/E1 coming into
Asterisk on a TE405P (for example), back out on another T1/E1 port, and
then into another digital device, such as a T1 channel bank; then you
plug the analog modems into that.
Someday, when Asterisk supports T.38 (and as T.38 employs T.30 protocol
I must also say that when it supports T.38 as *reliably* as HylaFAX
employs T.30), then you could plug your modem into an ATA that supports
T.38 and use T.38 to avoid VoIP-streaming the fax audio signal.
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