Round 1: Telephonic Round They asked about core Java and a Programming question. GSM architecture (SS7 Stack) ,Mysql. Round 2: F2F Went through multiple stages. Stage 1:They asked about the GSM architecture and IMS architecture. Two questions of Programming. Stage 2: They went through my CV and asked about my past experience. Interviewed on Java, Mysql , Linux. One more Programming question , just to check for the approach for problem-solving. Stage 3: Kind of a Managerial round. Stage 4: HR round Disappointed with the way they handled after the interview. After few days HR asked for my Salary slip and all but did not respond with anything after that . I enquired once or twice after that HR was like it is pending at the management end.