Firstly they only look for communication they need a fluent people. If you have Fluent communication and manageble skills this interview is piece of cake. There are 6 rounds when I was interviewed. 1. JAM:(self topic and HR's random topic) 2. Voice and accent :(they mainly stress on vocabulary and fluency just be as simple as you can then followed by mock call) 3. Vesrant: (the eliminating round for many people but the tip from my side use better accent and listen carefully be calm and repeat clearly though you missed listening words understand scenario and form suitable sentence) 4. Operations: all technical questions related to internet and basic questions like ip, Lan, Wan, are asked. 5. Online assessment : consists of Aptitude, logical and reasoning questions. 6. The final HR round: congo if you made it upto here. Just few questions of yourself and salary discussion.

1 round is communication (bacis hr round question) 2 round is also communication but advanced, you have to participate in a mock call and give it solution to them , which I found herder for a fresher.