All routers work Connects to Ethernet RJ45 and 9V adapter (Rs 80 in
mahaboudha china market, the one that came with phone bought in US was
120V so I changed it to 220V).

Phone runs Skype only. No configuration needed. That phone has built in skype, just turn the phone on, sign in with your skype ID and password, you are now ready to make skype to skype calls (in or out). (but no phone number yet).

Forget google voice if it confuses U. Or  if really interested, visit Ring2Skype's Facebook page and see the discussion (I've posted there with a the name: Sinten Bikash)

Easiest one is, integrating with Ring2skype.com:

Go to ring2skype.com

Sign up for a US number (or as many as you want from different countries/cities). While you sign up, you need to enter your skype ID (not password) and it gives a specific number for your skype ID. Whenever that number is called, that call is rings to your Skype, wherever in the world you are, for FREE. So, if you are online in skype in several locations with same ID, all locations will ring...you answer it in one of them. As your skype phone will be online in Nepal, it rings whenever that number is called. If your other family members are in another country, you can get local numbers for them from over 40 countries, and when they call that number from ring2skype.com, they all ring to YOUR skype.

If this too sounds complicated, PM me your skype ID (no password) and I will set up a US number for you. Calls to that number will ring your skype, answer there..try it...it's not that complicated.