<div dir="ltr">Hi,<br><br>I'm using the following setup :<br>Alice ---- IPPhone ------<LAN>----- Media gateway ----<PSTN> ------- Phone ---- Bob<br><br>For certain calls, users complains about echo : they can ear their own voice in their handset, though media gateway echo cancel is turned on.<br>
<br>I'm wondering how this echo cancelation engine is supposed to work.<br>My understanding of echo is that most probably, when users complains about earing their own voice, that means that distant phone or nearby equipment is "leaking" : Bob's phone is sending Alice's voice signal back to Alice.<br>
<br>So, to properly cancel, I would say Media gateway should substract from incoming signal the signal that left the media gateway few ms before.<br><br>Discussing here and there, some say that Media Gateway never work this way : it would only filters out locally generated echo.<br>
Do you agree with that ?<br>If positive, then what can you do, if Bob's phone generate much echo ?<br><br>Regards<br></div>