Years ago companies realized that by allowing their call center agents to work from home or by contracting with a virtual call center company they could save a lot of money.
XACT Solutions is a company that contracts with other businesses to handle their customer service needs so you could be working with a wide variety of clients if you are hired.
Some companies require both customer service and sales. Most call center companies route incoming calls to your home phone but some companies also require you to make outgoing phone calls as well.