@martinianpaul wrote:
VoIP (it stands for Voice over Internet Protocol) means that you make calls over the internet rather than over the traditional phone network.
It doesn't mean it's always over the internet, it means it's over the 'Internet Protocol'.
For some 'Over The Top' VoIP providers e.g. Skype, this does mean it's over the public internet, however for Virgin Media it's a private IP connection between the Hub and Virgin Media. It's separate to your internet connection for Ethernet and WiFi.
There is then also technology required to connect your Hub phone connection to the wider telephone network so you can make calls to people with other phone providers and they can call you. These all come with their own hardware, power and maintenance costs.
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I work for Virgin Media - but all opinions posted here are my own