Problems with mutiple simultaneous Calls on 4-Port FXO and 2801 VGW

Unanswered Question
Oct 18th, 2007


I've a 2801 VGW with VIC2-4FXO card installed. VGW is configured as H.323 GW. Every thing works fine as long there is a single call on the FXO Port. But as soon as a second call has been made, the quality of the second call is realy bad, a lot of echo and the speech quality is like somebody talking on the "walkie talkie". I've tested a lot of echo cancellation config with input gain, attenuation etc. also Echo Canceler Enhancements. But nothing helped.

Below given is the config of one of the voice-ports:

voice-port 0/0/0

translation-profile incoming incoming

input gain -3

no vad

no comfort-noise

Any Idea? Any solution would be highly appreciated.


I have this problem too.
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a.mehmood Thu, 10/18/2007 - 06:44

thx for your quick reply.

But as you said, doesn't seem to be a impedance problem. Because all works fine as long one call is active.

But I'll surely do that testing, who knows :)



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