As i have told you see it would require these things.
5.Bandwidth for Voice Packets According to seat
6.Head Phone with dial Pad
These are the requirement for call center.If you calculate on avg.12 to 15 lakh cost you for setting up call center of 15 seats.Which include all these.
Than if you will go for recurring cost that it wud be 2.50 $ per seat per hour.So recurring cost also you can check.
But if you have good agents.YOu can make 700-800 $ per agent per seat per shift(of 8 hours).And recurrring cost would be 500 $ maximum.So business is profitable but it wud require more money and patience.