On a new 409 module set up for a small motel,the customer reports that the phone at extension 18 will start ringing. When they answer the call no body there. This may happen about two times a day.
So I did a system initialization, then reprogrammed it and was getting ready to leave and it happend agian. This time I got to see for my self what it was doing. I set up a single line phone next to the 18D. I also have DSS keys programed on the 18D, and when the single line rang (18) I also saw ext 17 light up. My ? why!!!