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Telecommunications call back system

  • US 4,139,739 A
  • Filed: 07/05/1977
  • Issued: 02/13/1979
  • Est. Priority Date: 07/05/1977
  • Status: Expired due to Term
First Claim
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1. In a telephone communications lines control system for controllably connecting local subscriber telephone units to long distance lines including a plurality of remote switching means for connecting local subscriber telephone units to selected long distance telephone lines, a central control means positioned at a location remote from said switching means for controlling the connection of said local subscriber telephone units to said selected long distance telephone lines, and means for connecting said central control means to said plurality of remote switching means, said interconnecting means transmitting data signals between said remote switching means and said central control means, a call back system comprising means for monitoring the status of said telephone lines, and for generating a "line not available" signal when one of said subscriber units attempts to access a predetermined set of lines and none of said lines are available, and for generating a "line available" signal when one of said set of lines becomes available;

  • means responsive to said "line not available" signal for storing the telephone number of at least one subscriber unit attempting to access said "not available" lines in predetermined locations in a memory;

    means responsive to said "line available" signal for scanning said memory locations in a predetermined sequence and calling the subscriber unit number in the memory location first in said sequence, andmeans responsive to said "line available" signal for generating a control signal to said switching means to cause such switching means to connect said called subscriber unit to said available line when said called subscriber unit goes off hook.

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