When you need a way to promote a business, sell more products or complete research, a telemarketing service can help you with that. It is important to discuss your needs with the agency first before you sign with them. They might be suitable for things like sales lead generation but not for research or vice versa. You can receive advice from representatives of these agencies who may tell you what option is best for you, if they can help you and so on. It is important to have this communication with them instead of possibly making a mistake that would make you lose money instead of bringing it in.