Hello, actually in my case we switched from hylafax and emulation of modems (t38modem or built in Freeswitch spandsp modem) to RxFax/TxFax apps combination. Because you need less of layers of software and solution becomes more simpler and stable.

Did you look on: https://github.com/gonicus/gofaxip project they try to remove layer of modem protocol for Hylafax.

On Sat, Aug 29, 2015 at 8:07 PM, Alex Crow <acrow@integrafin.co.uk> wrote:

Hi,

I asked this question a *long* time ago as I was having major problems
receiving faxes using HylaFAX and the builtin FS Modems, in that the FS
Modems did not have any kind of flow control, which resulted in a
repeated backing off of baud rate until the incoming faxes failed with a
rate of over 50%.

Has there been any change in the softmodem code to add flow control so
that this does not happen any more?

Best regards

Alex

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Best regards,

Volodymyr