The Cisco ATA 191 Analog Telephone Adapter is designed to bridge the gap between traditional analog telephony and modern IP telephony. This versatile adapter features two FXS ports, allowing users to connect standard telephones, fax machines, or overhead paging systems to an IP network. With its wall-mountable design, the ATA 191 is perfect for small offices or enterprise environments, providing a cost-effective solution for integrating legacy devices into a VoIP system. It supports a variety of voice codecs and offers features such as call forwarding, echo cancellation, and adaptive jitter buffer, ensuring high-quality voice communication. The device is compliant with various standards, including IEEE 802.1Q for VLAN tagging and supports secure boot and AES encryption for enhanced security.