1
Daniel Sheinbein: Method and apparatus for screening telephone calls. Bell Telephone Laboratories Incorporated, Charles H Davis, July 7, 1981: US04277649 (308 worldwide citation)

A telephone system is disclosed for providing customized telephone services. A called customer can screen calls incoming to his station based on the identity of the calling line. The calling line's identity is forwarded to the switching office containing the called customer's screening memory. The m ...


2
Gilman R Stevens, Babu Mani: Method and apparatus for screening telephone calls. Alcatel USA Sourcing, Anderson Levine & Lintel, March 5, 2002: US06353663 (163 worldwide citation)

Callers to a number subscribing to a screening application are prompted that a fee will be charged for the connection to be completed. The prompting can occur at the initiation of the call, prior to any connection to the called party, or after the called party has had a chance to screen the call. Th ...


3
Iglehart David, Ford Gordon: Future blocking of incoming telephone calls.. Rolm Co, September 8, 1993: EP0559047-A1 (7 worldwide citation)

Method and apparatus for screening telephone calls for use in conjunction with a telephone set as, opposed to a switch, which provides a capability of storing a telephone number for use in blocking calls from the telephone number, without the need for re-entering the telephone number.


4
Frederick M Kruger, Richard Leifer: Method and apparatus for screening telephone calls in response to an answering device beep tone. Richard Leifer, Collard & Roe P C, June 16, 1998: US05768344 (3 worldwide citation)

A remote audio monitor for use with a telephone answering device connected to a common telephone line enables the screening of an incoming telephone call from a remote location with respect to the answering device. The remote audio monitor monitors the changing DC voltage levels of the telephone lin ...