Jean-Yves Avenard wrote:
I don't see why rxfax would be less reliable than iaxmodem/hylafax as
it's using the same spandsp to receive fax.
spandsp is a dsp library with lots of pieces to it. IAXmodem uses the
T.31 portion (the Class 1 modem) which uses the actual DSP parts of
V.21, V.29, and V.27ter (and potentially V.17). However, the bulk of
the fax protocol is actually performed by the HylaFAX Class 1 driver.
With txfax/rxfax it does not use the T.31 portion, using the T.30
portion of spandsp, instead, and thus also does not use the same fax
protocol driver as does the HylaFAX+IAXmodem combination. So the only
thing the same are the DSPs... V.21, V.29, V.27ter (and potentially V.17).
So it is entirely possible for users to find IAXmodem+HylaFAX fax
operation to be substantially different from txfax/rxfax.
The only difference I can think of is iaxmodem disable V17 reception
within spandsp which is known to be a bit unreliable in reception.
txfax/rxfax do not attempt to use V.17 by default, either, to the best
of my knowledge.
The difference is in the approach to handling fax protocol.
Lee.
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