India was about to attack Pakistan

na na na I guess you did not read the article. Pakistan know EXACTLY from where the call originated.

It may be that Indian Foreign Minister may indeed have made the call but after getting checked by other world powers he is now trying to disown the call. I mean how can he say that yes I made the call but then due to "world pressure" we are not going to do what I said we are going to do. There goes Congress's chances for the next election.

As far as proof is concerned, its exactly the same proof that India has provided to Pakistan. Just learning by example :)