further call center works on fallowing area

Out-Sourced Bureau:Out-Sourced Bureau call center is a place where they work on contract basis .It is nothing but a Third Party call center.
Captive in House Call Center:Captive in House call center is a place where company set up its own call center for the purpose of business.

Voice Process:When you talk to the customer over the Telephone it is called Voice Process like Telemarketing, Selling etc.Non-Voice Process:E-Mail Support, Chat, Touch Screen, etc.E-Mail Support there should not be any grammer
Technical Call Center:Technical Call Center is a place where they works on computer like Software ,Networking ,Hardware ,Trouble Shooting.To provide step by step solutions to the customer on Technical issues.
Non-Technical call center:Non-Technical call center is a place where they deal with other than the computers.