Why do I get echo only when calling certain people?
I am seeing an issue where I get a very bad echo only when calling to or from certain people. For the most part the system has no echo, but when I call certain individuals, or they call us we get a very bad echo. I am seeing this on two different systems. Both are using MGCP gateways one is a VG200 the other is a 4006AGM. I have echo-cancel coverage configured on the interfaces. Again I see no echo for 98% of the calls, but one or two have a very bad echo. And I can call the same person time and time again and get the same echo
Re: Why do I get echo only when calling certain people?
It's possible that one person has a phone whose volume is turned up high, or whose handset/headset/speaker does not do a very good job of acoustic echo cancellation. Or, if it's an analog phone on the G3 you're calling, the echo could be created by the hybrid involved in the digital-analog conversion.
In any case, you should be able to tune the echo by adjusting the dB level settings on the gateways. Try something like output attenuation 6 and input gain -4 on the voice ports.
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