×

PBX telephone call control system

  • US 4,747,124 A
  • Filed: 05/06/1985
  • Issued: 05/24/1988
  • Est. Priority Date: 09/28/1982
  • Status: Expired due to Term
First Claim
Patent Images

1. A call control system for being coupled to a PBX-type exchange (hereinafter said PBX) in order to control the routing of telephone calls from one or more calling parties through said PBX between a plurality of incoming external trunks and a plurality of internal telephone subscriber lines connected to internal telephones, comprisinga line interface unit connected to some of said internal subscriber lines for simulating a plurality of telephone extensions which can be called by said one or more calling parties through said incoming external trunks or through said internal telephones connected to others of said internal telephone subscriber lines to provide a multiple cell processing capability, said line interface unit includingmeans for detecting that a calling party using one of said incoming external trunks or said internal telephones is calling one of said plurality of simulated extensions,means for answering said calling party on one of said incoming external trunks or said internal telephones and informing said calling party to signal a certain extension number corresponding to one of said internal telephones connected to one of said internal telephone subscriber lines,DTMF means responsive to a signaled extension number for receiving and decoding said signaled extension number from said calling party, andmeans for signaling said PBX to attempt a transfer of said caling party to said extension having said certain number.

View all claims
  • 7 Assignments
Timeline View
Assignment View
    ×
    ×