Inbound telemarketing is a process whereby call centers are created to accept telephone orders, consumer inquiries, and customer service requests. There are several companies that operate 24/7 call centers and sell services such as sales and support, answering services, and order taking and fulfillment. Companies have outsourced these services because it has proven to be more cost effective than operating their own call centers. A company specializing in inbound telemarketing can also offer unique services such as multilingual support, 24-7 availability, and multiple call centers with redundant telephone switches. They can also more easily adapt to the crests and troughs of telephone volume since they can share resources across multiple companies and time zones.