Echo should be removed at the endpoints, not in the middle of the stream. In most cases, if you hear echo then the other end's echo canceller is not working, and vice versa. One thing you can do is tcpdump or pcapsipdump the traffic coming in on the wire and listen to the audio in Wireshark's player tool. (If the codec is PCMU or PCMA.) If the echo you hear is in the RTP stream that comes in on the wire then you know the echo can on the far end is not working very well.<br>
<br>-MC<br><br><div class="gmail_quote">On Mon, Jan 21, 2013 at 10:36 AM, Mimiko <span dir="ltr"><<a href="mailto:vbvbrj@gmail.com" target="_blank">vbvbrj@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 class="im">On 21.01.2013 09:56, Dmitry Lysenko wrote:<br>
> The problem with other side phone or PSTN gateway.<br>
> Different delays in voice path, so in one case AEC algo work well, but<br>
> not for another.<br>
> WBR.<br>
<br>
</div>I made calls to different types of networks: PSTN, VoIP, GSM. About 50%<br>
I hear echo. Including calling to same number consequently, echo ay be<br>
present or not.<br>
<div class="HOEnZb"><div class="h5"><br>
--<br>
Mimiko desu.<br>
<br>
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