6. Plug the power into the telephone and then the line cord to the wall socket and the line socket
on the telephone’s line socket (there’s only one socket the correct size).
7. To confirm the headset and telephone works, press the call button on the headset. You will
notice the green light on the headset base and the red light under the phone’s
handsfree/headset button turns on. You should hear dial tone.
CS540 to IQ750EHS Wiring Diagram
