Phone Circuit.

a 3-way switch turns phone service on/off from 2 locations

an LED indicates when the phone is on/off at the 2 locations

a switch toggles phone service between the land line (local) and internet
phone (long distance)

N.C. contacts permit use of the phone when power outages disable the relay
coil.

http://www.stonetabernacle.com/PHONE_CIRCUIT.html

On Friday, January 23, 2015 at 11:29:14 PM UTC-5, Jonny Quest wrote:
Phone Circuit.

a 3-way switch turns phone service on/off from 2 locations

an LED indicates when the phone is on/off at the 2 locations

a switch toggles phone service between the land line (local) and internet
phone (long distance)

N.C. contacts permit use of the phone when power outages disable the relay
coil.

http://www.stonetabernacle.com/PHONE_CIRCUIT.html

Right, but why pay for it? Because that's before Apple and PC computers started going wireless and/or high speed internet.

Now you can do all that from a desktop, tablet or your wireless phone service (like with "Skype" and "MajicJack" and through most chat rooms.