Phone Gizmo Needed
Augat Communications/MELCO makes a remote access unit. Suggest you
check with your nearest Graybar office for details and prices. They
aren't inexpensive, though. Used to be called the RA-330. It's got
simple DTMF (TouchTone) password protection. Be careful, though. You
can get stuck for a pretty big long distance phone bill if somebody
"cracks" the passcode.