- Routes both incoming and outgoing calls - Allows an Emergency device to share a phone line with other devices (fax machines, phones, modems) - Gives priority to the Emergency devices - Incoming calls routed to one of two ports by Caller ID, Distinctive Ring or Quick Call Back - Status LED displays mode of operation - Can store up to 12 Caller ID numbers - Provides a busy signal to the phone port when an emergency device is in use