telemarketing -
The business of selling products or services by making unsolicitedtelephone calls to potential customers.
Wikipedia
Telemarketing (sometimes known as inside sales, or telesales in the UK and Ireland) is a method of direct marketing in which a salesperson solicits prospective customers to buy products or services, either over the phone or through a subsequent face to face or Web conferencing appointment scheduled during the call. Telemarketing can also include recorded sales pitches programmed to be played over the phone via automatic dialing. Telemarketing has come under fire in recent years, being viewed as an annoyance by many.