What does a Telemarketing do for a client? They spend time getting to know the clients and their products or services. They also find out what kind of customers target at.
I think Mommy once worked in a Telemarketing environment when Mommy was studying in Australia. It was a casual job to support living expenses. I know Mommy like the job very much. Mommy was always saying it was the best job ever. Mommy would randomly call people and initiate conversation and in return get information to help the research team.
Sometimes when Mommy gets a call from a Telemarketing company Mommy answers all their questions because she knows its hard work. They work really hard as they have to enter all the details into a computer as soon as you speak or say something. Almost all conversations are recorded for later use. I'm sure everyone has heard of the "announcement" which says all conversation will be recorded. This is to help in research and just in case important information is overlooked.