An Analog Telephony Adapter, or ATA, is a device used to connect one or more standard analog telephones to a Voice over IP based network. It usually takes the form of a small box with a power adapter, one Ethernet port, and one or more FXS telephone ports. Users can then plug one or more standard analog Telephones into the device and they will operate, usually transparently of the VoIP network. A typical VoIP Solution A typical analog telephone adapter for connecting an ordinary phone to a VoIP network Voice over Internet Protocol (also called VoIP, IP Telephony, Internet telephony, and Digital Phone) is the routing of voice conversations over the Internet or any other IP-based network. ... Ethernet is a frame-based computer networking technology for local area networks (LANs). ... FXS can stand for: foreign exchange station fragile X syndrome This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Telephone This article is about telephone technology. ...

ATA's are used by many VoIP companies selling a telco-alternative VoIP service, where the device is used to replace a user's connection to an existing telephone company. When sold in connection with a VoIP service like Vonage, the ATA is usually locked so it cannot be used with another company, and the user cannot change very much of its configuration.

ATA's generally use the SIP protocol, and are manufactured by many companies including Cisco, Grandstream, Motorola and Siemens. Session Initiation Protocol (SIP) is a protocol developed by the IETF MMUSIC Working Group and proposed standard for initiating, modifying, and terminating an interactive user session that involves multimedia elements such as video, voice, instant messaging, online games, and virtual reality. ... Cisco Systems, Inc. ... The Grandstream Budgetone 100 series Grandstream is a company which produces low-cost SIP-based Internet telephony hardware. ... Motorola NYSE: MOT (TYO: 6686) is a global communications company based in Schaumburg, Illinois, a Chicago suburb. ... Siemens has the following uses: Siemens is a German family name carried by generations of the telecommunications industrialists, including Werner von Siemens, Sir William Siemens, Wilhelm von Siemens and Peter von Siemens Siemens AG is a German electrical and telecommunications company, founded as a telegraph equipment manufacturer by Werner von...