I seem to be having the same problem… Just have a simple setup now, a TDM400P with a single FXS and a single FXO.
[incoming]
exten => s,1,Answer()
exten => s,2,RxFAX(/tmp/fax.tif)
and
[channels]
…
faxdetect=no
immediate=no
overlapdial=yes
When I call, it answers with the typical fax sounds. When I send something, the sending machine shows “line error”, and doesn’t actually send. Monitoring the line on the sending machine (seperate phone with mute), it sounds like RxFAX() isn’t actually hearing the other end. It continues to send the initial handshake over and over, even though the sending machine is sending the reply handshake, and attempting to send image data…
Anybody have any thoughts?
Asterisk 1.2.9.1
zaptel 1.2.6
spandsp 0.0.2pre26
-Matt-