The Cisco ATA 191 2-Port Analog Telephone Adapter is designed to bridge the gap between traditional analog communication devices and modern IP telephony applications. With two RJ11 FXS ports and one RJ45 Ethernet port, this adapter allows you to connect analog phones, fax machines, and overhead paging systems to your VoIP network. It supports a variety of voice codecs and features such as caller ID, call transfer, and echo cancellation, ensuring high-quality voice communication. The device is wall-mountable and operates efficiently with a power consumption of just 5 watts. Its robust design and compliance with various regulatory standards make it a reliable choice for both small offices and enterprise networks.