ZTE Packet Core Engineer interview questions

I applied for a job in NOKIA for the post of PACKET CORE ENGINEER (FM) at Noida Location. Pay-roll is Samax. I got a call from Samax, saying that your resume is short-listed for the above role. On thw very next day, i got a call from Nokia. He interviewed me for 30 mins regarding Basic 3G call Flow, Interfaces & Hardware info of each & every Node. I answered all the questions including O & M process. Finally he told me, that he forwarded my resume to Next round. After two days i contacted Samax team for Update........finally Not selected...