Initial telephonic discussion of approx 90 minutes. Most of the questions around basic C++, OOD, multithreading, different types of pointers and STL etc. I was called for a panel interview after 3 days which took approx 3 hrs. Initially I was given a case study of OMS system more focusing on performance and memory. For two hours I continued with design on approx 6 white boards. It was followed by a intense discussion of approx 1 hour.