[Asterisk-Dev] Fax detection, handling and bridged calls?
john harragin
jharragi at mw.k12.ny.us
Mon Jan 26 14:29:03 MST 2004
I've been getting echo on bridged calls with echocancelwhenbridged=no. It
appears that many of my toshiba pbx (connected with an em_w T1) calls are
being detected as fax calls. 'Fax Detected, but no fax extension'. In
'zap show channel' 'echo cancellation' is indeed off - but 'Fax Handled'
is yes. This is introducing some pecular echo.
I have not yet determined why this is happening - I have some centrex
trunks on the pbx. Perhaps it is sending * some centrex stuff that is
being interpreted as fax tones. I'm still looking... but this behavior
still leads to some questions.
I suspect 'fax handling' should probably bi-pass on bridged calls with
echocancelwhenbridged=no - but as a non-user of this feature, I'm not
sure what all of the benefits are. Whatever, it seems that nothing good
can come from adding delay to a psudo-tdm fax call. In this case the call
should merely be routed to a fax extension if desired. Am I overlooking
something?
Anyway, in this particular case, it would be fine to disable fax
detection & handling completely. Can this already be done?
John
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