Having FS plus a Sangoma Card with echo cancel, is necessary to disable echo cancel in order to sending/receiving faxes? How can it be done?<div><br></div><div>Regards<br><br><div class="gmail_quote">2011/5/12 Steve Underwood <span dir="ltr"><<a href="mailto:steveu@coppice.org">steveu@coppice.org</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">On 05/12/2011 05:21 PM, Juan Antonio Ibaņez Santorum wrote:<br>
> Hello Steve!<br>
><br>
> I would like to ask you one question about fax system. You told<br>
> that using FS+mod_spandsp could be gotten successful faxing rates over<br>
> 99%. Looking at your experience, is 99% nearer to 100% or to 99%?<br>
> Which errors do you find usually on that 1%?<br>
><br>
</div>You can run tests all day in a lab without failure. The real test is how<br>
well things work against a wide diversity of machines in the real world.<br>
This <a href="http://www.soft-switch.org/spandsp-soft-fax-performance.html" target="_blank">http://www.soft-switch.org/spandsp-soft-fax-performance.html</a> says<br>
something about our testing, and what is achievable. Its quite a lot of<br>
work to get real reliability numbers. You get a lot of call failures on<br>
a typical public FAX server due to things like wrong numbers, voice<br>
calls into a FAX port, people purposefully dropping half completed FAX<br>
calls, and buggy FAX machines doing weird things. Don't ignore the last<br>
one. There are famous make machines with serious bugs. You need to<br>
manually check the failed calls one by one to get real reliability<br>
figures. In the end there are always a few calls where you are never<br>
sure who's fault the failure is. All I can say with hand on heart is the<br>
number of unexplainable failures is well below 1%<br>
<br>
Regards,<br>
<div><div></div><div class="h5">Steve<br>
<br>
<br>
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