The Cisco Analogue Telephone Adaptor (ATA) 191 is a multi-platform analogue telephone adapter that transforms traditional telephones, fax machines, and overhead paging communications devices into IP phones and devices. It is ideal for customers with enterprise networks, small offices, and Unified Communications as a Service (UCaaS) from the cloud. This IP phone adapter is well-suited for daily use while safeguarding your analogue investments during the transition to IP networks.