I have worked in a call center in kolkata for few months. Pain and Fun both were there depending on the companies rules and regulations. I am 35 years old, in 1999 I did my B.tech from Jadavpur Engineering College. Situation was not like the present, Graduate people used to work in grossery stores on that time in Calcutta. Afterwards we saw BPO ( few are cold call telemarketing companies , I don't know how these comes under BPO). Now atleast a 12 guy with one ebility of english speaking can earn 8- 15 thousand per month. So call center has both the aspects. For a person its good, and the other its bad.....Stay cool.