how exactly do you utilize that extra jack on the back of the sts phones and how is the jack wired.

thankx...

It is basicaly just a pass through, wire both pairs on the jack and use a 2 pair line cord. At that point you can terminate whatever you want to the extra pair. It's nothing fancy.

what friggin line does it use....

If I wire 2 pair to a jack and then plug a line cord from the AUX. JACK on the phone to a modem, how does it know what line to use...

DAMN VODAVI, their documentaion must have been written by the Panasonic Japanese to English Conversion Department...

It does'nt know what line to use, whatever you puch down to the other pair is what you will have at the other end. You could pass one of the single line ports through the extra pair or another digital station or plain old dial tone. The only thing I have used it for was in a warehouse situation where I had to run molding across the floor for a desk out in the open and the customer decided to have another phone at his desk so instead of running another cable along the floor I just used the extra pair to run another set and plugged it right into the existing one.

Ground start,

Remember the little off white 267C line1/line2 adapter, Now Imagine that jack in the botton of the phone as the line2 hole. That is all it is It Just brings the 2nd pair to the phone. No electronics involved

This jack is handy for hooking up a DSS, Plug the Dss into the aux jack with a short station cord and hook the second pair of the phone jack to the station port programed as the DSS

Ummmmm, this post is over four years old. The original poster passed away almost two years ago.