Quote Originally Posted by bill875 View Post
Just for the record, I too have experienced hearing DTMF tones when my mom calls out from the VOIPo line to my POTS line at my office. It is irritating and I too would like to know how to solve it.

Also, mostly when talking to someone on a cell phone, the person on the cell phone claims to hear an echo of their own voice. These are the only problems I've had though.
Generally, the cell phone echo problem you mentioned might be helped by turning down the volume on the cell.

Conversely, you might ask support to turn down the transmit and receive levels in your adapter.