A related form of marketing is considered to be infomercials. They are usually called direct response marketing more than direct marketing for the reason that they try to achieve a direct response with the help broadcast on a third party’s medium, but viewers reply directly via telephone or internet.
TV-response marketing like infomercials -can be measured a form of direct marketing, since reaction is in the form of calls to telephone numbers given on-air. This both makes possible for marketers to sensibly conclude that the calls are due to a special campaign, and allows the marketers to get customers’ phone numbers as targets for telemarketing.