Just got a VOIP phone -- how the hell does it work?

[teddyFBI]

So i bought a generic-brand VOIP phone that has a USB chord extension because it seemed like a cool product that the website said was compatible with Vonage service.

Only problem is I have no idea how this thing is supposed to work with my vonage service. Where do i plug it in? The router that Vonage sent me doesn't have any USB input jacks, only RJ-11 (ethernet) and a standard telephone jack.

So I called up Vonage tech support and they informed me lo and behold that USB phones aren't compatible with Vonage service, even though the phone's manufacturer said it was supposed to be. But the Vonage tech support guy was indian and didn't sound like he really knew what he was talking about, so I'm not sure he gave me correct info.

Anyone want to help a brother out?