Quote Originally Posted by burris View Post
I've never experienced this problem...

Sometimes you may find that the receive volume on your phones is set too high. That can cause not only hearing these tones, but echos as well.
The persons we are calling are the ones hearing it (we don't hear anything). 4 different calling parties reporting the problem (including myself) that never heard it with our old provider. Input/Output gains on PAP2T are set to -2/-2.