In terms of the name - I'd certainly be taking VoIP into account however you've got to look at the big picture. You'd be competing with the likes of Skype who have over 13,000,000 people online at pretty much every minute of the day.
Another thing to look into is perhaps Voiceovers, maybe a freelancing market for Voiceover Jobs; you know for Radio and Film etc.
Best bit of advice would be to take a look at the various markets within 'voice' and look at the competition and see how you can manipulate your business model to offer a unique twist that they don't.
Best of luck!
Aspiring Young Entrepreneur
Before success will come failure.