<div dir="ltr">Tamas not only mod_portaudio.<div>In my case used one leg terminated to FXS gateway, other leg terminated to PSTN via ISDN PRI/E1 gateway.<br></div><div>Echo is observed for some calls. I think the echo is formed on the side of the subscriber connected to PSTN.</div><div>I counted that the echo comes back with a delay of 44-64 ms or more (more detail <a href="http://www.adaptivedigital.com/product/echo_cancel/echo_explain.htm">http://www.adaptivedigital.com/product/echo_cancel/echo_explain.htm</a>).<br></div><div>Where:</div><div><ol><li>20-30 ms - packetization time on a-leg<br></li><li>~1 ms - VoIP packet delivery<br></li><li>~ 1 ms - PSTN network signal delivery<br></li><li>~ 1 ms - PSTN network return signal delivery<br></li><li>20-30 ms - packetization time on ISDN PRI gateway<br></li><li>~1 ms - VoIP return RTP packet delivery<br></li></ol></div><div>If FS will apply echo canceller then is required compensate 22-32 ms echo for each leg.</div><div><br></div><div>Sergey</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Apr 19, 2015 at 9:11 AM, Tamas Jalsovszky <span dir="ltr"><<a href="mailto:jalsot@gmail.com" target="_blank">jalsot@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><span class="">On Sat, Apr 18, 2015 at 11:39 AM, Steve Underwood <span dir="ltr"><<a href="mailto:steveu@coppice.org" target="_blank">steveu@coppice.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span>> Could you help me understand that prevents the use echo cancellation in FS<br>
</span>How would you expect to use echo cancellation in FS?<br></blockquote></span><div>It could be useful with for example mod_portaudio, IMO<br><br></div><div>Regards,<br></div><div> Jalsot<br></div><span class=""><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Regards,<br>
Steve<br>
<br>
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