Their service can be obtained easily from the US & Canada to the UK. They will supply a special phone adapter to connect your broadband internet phone to your broadband connection. This adapter basically converts your voice into digital format for transmission across the network. It is converted back again at the recipients end to enable your voice to be heard. In addition to the features and services that each broadband internet phone provider offers, you should also look at their levels of customer service.
More on broadband speed check and broadband cable telephone