Automatic call transfer system capable of carrying out call transfer without ...

[54] AUTOMATIC CALL TRANSFER SYSTEM
CAPABLE OF CARRYING OUT CALL
TRANSFER WITHOUT MANUAL
OPERATION

[75] Inventor: Minora Tanaka, Tokyo, Japan

[73] Assignee: NEC Corporation, Japan

[21] Appl. No.: 700,107

[22] Filed: Feb. 11,1985

[30] Foreign Application Priority Data

Feb. 14, 1984 [JP] Japan 59-25506

[51] Int. a.* H04Q7/04

[52] U.S. CI 379/57; 379/57;

379/60; 379/211; 379/170; 340/825.44

[58] Field of Search 179/2 EC, 18 BD, 18 BE,

179/18 BF, 18 B, 99 P; 340/825.44, 311.1, 825.45, 825.48; 455/33

[56] References Cited

U.S. PATENT DOCUMENTS

3,588,371 6/1971 Dal Monte 455/33

4,057,790 11/1977 Fleming etal 340/224

4,174,476 12/1979 Frost 179/2 EC

4,178,475 12/1979 Taylor et al 179/2 EC

4,313,035 1/1982 Jordan et al 179/18 BF

4,336,524 6/1982 Levine 340/825.44

4,468,813 8/1984 Burke et al 179/18 B

4,479,124 10/1984 Rodriguez et al 340/825.44

4,567,323 1/1986 Lottes et al 179/18 B

4,577,060 3/1986 Webb et al 179/2 EC

4,577,062 3/1986 Hilleary et al 179/2 A

4,577,066 3/1986 Bimonte et al 179/18 B

Primary Examiner—Robert G. Lev

Attorney, Agent, or Firm—Laff, Whitesel, Conte & Saret

[57] ABSTRACT

In an automatic call transfer system for use in carrying out transfer of a terminating call from one of telephone sets (T) to another through an exchange (11), a person identification number (ID) is assigned to each of persons movable in a limited area and is generated from a transmitter (TX) conveyed by each person. The limited area is divided into a plurality of zones (Z) which are defined by receivers (RX) connected through subscriber lines to the exchange, respectively, and which include at least one of the telephone sets, respectively. The person identification number is produced from a transmitter (TX) conveyed by each person and is received by a selected one of the receivers in the zone for the selected receiver to be sent through one of the subscriber lines (L) to the exchange. A line number of the one subscriber line is memorized in a memory of the exchange in correspondence to the person identification number and is changed as each person moves in the limited area. Responsive to the terminating call carrying the person identification number, the exchange searches the memory to detect the line number memorized therein and to transfer the terminating call to one of the telephone sets indicated by the memorized line number.

7 Claims, 8 Drawing Figures