I'm using a HT-502 and during a phone call the other party complained of hearing DTMF tones. This has only happened once that I'm aware of.. Just an FYI this issue might not be exclusive to the PAP2.

Recently calling a friend I received a recorded message "Goodbye" then a fast busy. This happed several times calling the same number. Turns out my friend was using his phone during the time I was receiving the "Goodbye" message.

Jim