These devices allow a conventional (analog) landline phone to work on the internet. These must be plugged into power, a router, and the phone you wish to use & are providing (this often entails placement of the ATA in close proximity to a router or mesh-point). They use 12v barrel-jack power adapters, please keep the power adapter with this device.

Please note that VoIP systems are a little different than analog systems - a phone number can either be a telephone number or a fax number, but not both.