If you do not have it setup on the systems set up SMDR. It will show what line the call came in on, this call will be at the same time that the call to India was made and be about the same duration. Since they have call ID most likely blocked you will not see their number. But the phone company will have a record of the call they will most likely not give it to you but they will give it to law enforcement folks. The phone company keeps this info almost forever even if they do not admit it