Cisco 4-port VIC-FXS/DID

Cisco VIC3-4FXS/DID 4-Port FXS and DID Voice Interface Card; FXS port is used to connect directly to phones, fax machines, and key systems. Generates battery polarity reversal and caller ID. DID port is used to provide off-premises DID connection from central office. Serves only incoming calls from the PSTN. Supports caller ID.