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:
translation-profile incoming incoming
input gain -3
Any Idea? Any solution would be highly appreciated.