Analog-Telephony Adapter (ATA)

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.
VoIP-Adapter / ATA