05161181 is referenced by 125 patents and cites 16 patents.

ANI Blocking System (ABS) logically interfaces between a calling party and a called party in a telephone network which provides CallerID and CallerID blocking. The ABS automatically: (1) accepts a call from the calling party; (2) places a call to the called party; and (3) connects the called party with the calling party.

Title
Automatic number identification blocking system
Application Number
7/463298
Publication Number
5161181
Application Date
January 10, 1990
Publication Date
November 3, 1992
Inventor
Nicholas Zwick
Denville
NJ, US
Agent
Michael B Einschlag
Assignee
Dialogic Corporation
NJ, US
IPC
H04M 3/50
H04M 1/57
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