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Call screening is the process of evaluating the characteristics of a telephone call before deciding how or whether to answer it.
Some methods may include:
In addition, in the US and Canada, Call Screen is the name of a calling feature offered by the telephone companies that allows a customer to establish a list of numbers; anyone calling the customer from those numbers will receive an automatic message indicating that the call is not being accepted. Another name, not usually used for marketing purposes, is „Selective Call Rejection“. There are also devices such as the TeleZapper for screening telephone calls. Entire description in Wikipedia