Remove the line cords from the Line 1 and Line 2 jacks located on the back of the phone. Pull out the line cords carefully from the RJ14 wall jack.
Reinsert the line cords into the empty jacks on the back of the phone, and reinsert the opposite end of the line cords into the RJ14 wall jack.
Remove the line cord from the "Handset" jack located on the left side of the phone. Reinsert the line cord into the jack to ensure the connection is secure.
Pick up the handset on the phone and press "Intercom" on the phone's control panel.
Press the station number using the keypad on your phone to select the station you wish to call.
Press "Intercom" to close the phone conversation or set the handset back on the phone's cradle.