I know you mentioned the monitor feature is not showing any digits but is there dtmf on the ports if you hook up with a butt set? I just want to check to make sure tones are being sent even though the monitor is not showing them.

If there are no digits showing, that could mean that the panasonic inband is not programmed. Mr Gemini mentioned that inband can be programmed and there may be nothing programmed.

Tip and ring, the work of the devil!