This site is packed full of articles about outsourcing telemarketing activity. If you wish to outsource telemarketing work, you need to consider a number of major factors including the following:
(1) Vendor selection - Which company you want to choose. In telemarketing activity, most companies over-simplify this process by simply find the first call centre they find on Google
(2) Pay Per Performance Telemarketing - a very common way to pay call centres for outsourcing work but you need to be very careful. It seems simply to outsource to companies but it rarely works. You spend a lot of time and go nowhere.
(3) Telemarketing Laws - There are plenty of laws which govern how you use telemarketing and so you need to be very careful