Cisco 2-Port FXS Enhanced and DID Voice/Fax Interface Card - Voice / fax module - analog ports: 2 - for Cisco 28XX, 28XX 2-pair, 28XX 4-pair, 28XX V3PN, 29XX, 38XX, 38XX V3PN, 39XX

Enhanced FXS port is able to connect directly to phones, fax machines, and key systems with loop length up to 11,000 feet (3.3 km). The card generates battery polarity reversal and caller ID. Also provides off-premises DID connection from central office and serves incoming calls from the PSTN.