The equipment that you need for your internet phone depends on which service you choose. The two standard items you will likely need are: A broadband connection: fibre-optic is more reliable, and unlimited means you can make as many calls as you like. A telephony adapter (TA): this comes with the service. You can plug any existing phone into the TA using a standard phone jack, then plug the TA into your cable or digital subscriber line (DSL) modem using a standard network cable. This enables your desk phones to make and take VoIP calls.