All you need to say is ..yes boss.and you are in the system.
Before interview back gound study of the organisational and its business
Basics of telecom should be on your tips if you dont have experience.
if you have experience must have knowledge of IN and linux.
Focus on the company and you individual experience while employed here
If you know someone inside Ericsson, Chennai - probably you don't even have to give an interview! Its that bad!
I personally know a bunch of people who got into Ericsson, Chennai without giving an interview just because they knew the manager or they knew someone close to the manager!
Fully technical experience
Core java, osgi, threading, memory management, collection, design patterns.
Dedicated preparation need