On 07/27/2012 09:53 AM, Eric Wieling wrote:
People seem to think that Asterisk won't disable the Echo Canceler when a fax tone is detected. Why they think that is a total mystery to me,.
Asterisk doesn't do this, the echo canceller itself does (or DAHDI does, in some cases). With modern ECs, as well, they don't even get disabled when a CED tone (from the answering FAX endpoint) is heard, they instead just turn off their non-linear processors, because it's been found through years of experience that leaving 'most' of the EC still in place makes FAX calls more reliable than if it was completely disabled.
Since the OP has a Sangoma card with an Octasic hardware echo canceller on it, he should just leave it alone and let it do its job :-) Turning it off is probably making things worse.
Sometimes I wish it was possible to selectively eradicate 'conventional wisdom' from the world!
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