You'll need a manual. You can get one from John at Manuals Plus 770-438-0707
I don't think there's many techs for the Executone forum, I know I'm not one but the manual will tell you how, you might also want to get a users guide for the phones, John should have them too.
Good Luck [Linked Image from sundance-communications.com]

After you read the manual you might want to be a moderator in this forum, God knows we need one. [Linked Image from sundance-communications.com]