I am reviewing the 3CX system. I have one problem. When I am connected to someone, the sound coming back to me is suffering from the feature that it becomes completely silent when the voice (noise) level is too low. Is that the VAD function? Anyway, this effect is so rigid that it is very irritating. The silence feels like the connection is lost. Funny is, i think, that this happens with sound to me, but my sound is not surpressed when i dont speak. I noticed this has to do with the codec, but i dont know how exactly i can manage this. Any help?