Follow these steps to make your call : 

1. Go here and register with your email address and phone number : Register Here
2. After registering go to this link : Click to Go
3. In Address 1 coloumn type your mobile number with prefix 91
4. In Address 2 coloumn type your freinds number with prefix 91
5. Your call will be connected immediately
6. This service does not support DND activated numbers.