VOIP Phones in India

I'm looking for VOIP Telephone Service in India, something exactly like Vonage do. They just issue a phone set, phone number and VOIP adapter and thats it.

I don't want a PC to be running like we have to using Skipe & Stanaphone. All I should require is a broadband connection at my home. I would just hook up my VOIP adapter to my broadband and the phone will work like any regular phone.

The catch is, if I buy a VOIP system here and hook the same adapter in India then I'll have a US working number in India. Now anyone from US can call this number just like a local number. Now, I want reverse of this. A Indian phone number working in US over VOIP so anyone in India can call me on that number.

If you know of any such system existing in India, please reply.

Any information is highly appreciatred.