Hello, Straight to the point. rxgain=20 causes dialplan extensions not to work from a nortel pbx, while rxgain=15 works fine. In both cases a standard analog phone can dial an extension without problem. from zapata.conf signalling=fxs_ks context => from_pstn amaflags => documentation echocancel=yes rxgain=15 channel => 1 Anyone have any ideas? This is more to bounce around than find a solution for, I am alright with an rxgain of 15. I am just curious as to why this is happening.