Re: still got ReceiveFax() problem, how to properly setup asterisk fax?
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Ok, Im putting back echo cancellation, since there's no change at all in the fax receiving success rate.
I'd like to focus back to the original topic.
My incoming faxes end up usually as either timeout or hangup error:
timeout - is this supposed to happen in an E1 line? Can the timeout threshold be changed?
hangup - currently more frequently encountered. I noticed in the console that the remote channel hangup status 16 shows up in the middle of the fax session. According to sangoma, this is a normal hangup but asterisk fax detects this as error. I have already set it to use the e1 line clock source.
On Friday, July 27, 2012, Kevin P. Fleming <kpfleming@xxxxxxxxxx> wrote:
> 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!
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> Jabber: kfleming@xxxxxxxxxx | SIP: kpfleming@xxxxxxxxxx | Skype: kpfleming
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