Hi, Do you have some experience with the "best" values for those parameters in youyr particular case? I mean the best raport between sound level in both direction and echo cancellation. For me, the best result I can get is with: rxgain=10 txgain=15 ... the sound level is good, but the echo is a little bit to strong for my taste. Something interesting is that if I put a txgain value greater than 15 (let's say 20), the external dial through X100P is not corrrect anymore. I get from the PSTN operator the message " the number you have dialed is invalid". Thanks, Dan