I Have DSL, Can I Wire My Entire House for Vonage VOIP?

Vonage works great...ON 1 LINE! But I need it through my whole house. Vonage support is terrible, people in India that don't speak very good english. So I am turning to the net for help. Can you wire the entire house for VOIP while still using a DSL line? Or do I have to switch to a cable modem (no chance) and disconnect the outside phone wire?