On 08/05/2011 07:51 PM, Kevin P. Fleming wrote:
On 08/05/2011 12:06 PM, Robert Thomas wrote:
I'm refering to the audio hook implemented to the detect the V21
preamble fax on the T38 gateway implementation on asterisk 1.10.
I think it depens whether they refer to fax detection to disable echo
cancellation, or to renegotiate to T38.
Neither. In most cases, 'FAX detection' in Asterisk used to to
redirect the channel to a different extension in the dialplan. This is
done by detecting CNG, so that the destination of the call can be
changed to one that is able to handle the FAX transaction. Asterisk
does not handle echo canceller reconfiguration for FAX at all; that's
done by DAHDI or the echo cancellers themselves.
Hi,
I've been using the asterisk 1.6.X. Here asterisk can only detect fax
tones with chan_dahdi. chan_ss7, sip and iax do not detect fax tones and
therefore do not forward the call to the fax extension. I see mention of
NVfaxdetect on the Internet, but it looks like this code is no longer
maintained.
I've just taken a look at chan_sip in 1.8.5, and it looks like 1.8.5 can
detect fax tones on sip channels. Will test this out later.
Asterisk 10 is still beta, and not suitable for production - but good
for testing.
A.
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