MULTIPLE PARTY TELEPHONE CONTROL SYSTEM WITH RANDOM DIALING FOR POLLING
 Inventor: Ronald A. Katz, Los Angeles, Calif.
 Assignee: First Data Resources, Inc., Omaha, Nebr.
 Appl. No.: 832,720
 Filed: Feb. 7, 1992
Related U.S. Application Data
 Continuation of Ser. No. 642,602, Jan. 17, 1991, Pat. No. 5,091,933, which is a continuation of Ser. No. 470,468, Aug. 26, 1990, Pat. No. 4,987,590, which is a continuation of Ser. No. 371,188, Jun. 26, 1989, Pat. No. 4,939,773.
 Int. CI.' H04M 3/56; H04M 11/06;
 U.S. CI 379/204; 379/92;
 Field of Search 379/204, 205, 92, 156,
379/158, 165, 355
 References Cited
U.S. PATENT DOCUMENTS
4,635,251 1/1987 Stanley et al 379/204
4,845,839 7/1989 Katz 379/93 X
To interface a primary telephone terminal with a vast number of remote terminals through a telephone network, parties at the remote terminals are individually screened to attain a select group. A random digit dialer unit may provide random dialing signals to the telephone network to establish communication with a plurality of connected terminals, as for polling applications. Bridged together, the select group is preliminarily informed of the status of the interface by a voice generator and, accordingly, the multitude of connections are synchronized for the interface. On cue, the select-group is coupled to the primary telephone terminal for unilateral communications. Deviations from the unilateral communication include select bilateral communication for a few of the remote terminals and digital communication from the remote terminals by push button as for polling applications. Subjects for interfaces are programmed for selection from a memory.
7 Claims, 4 Drawing Sheets