Yes the call was for general relationship questions like marriage date, my dob, my job, last visited India and how did we met. Short call for 4 mins.
The lady officer called my wife cell 2 times which was missed by my wife. After that, she called my father in law and asked about my wife if she is there. As my wife is living at my house, my father in law requested to call back on my wife's mobile after 5 to 10 mins. To my surprise that nice lady called my wife back after 10 mins and had a talk.
For me there was no heads up for the interview call. Number from where she got a call - 011-41782000