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Interface circuit for a telephone system

  • US 4,484,031 A
  • Filed: 06/21/1982
  • Issued: 11/20/1984
  • Est. Priority Date: 06/21/1982
  • Status: Expired due to Fees
First Claim
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1. A method for routing a telephone call received from one of a group of trunk lines, which serves a private branch exchange (PBX), through a select one of a plurality of two-wire lines connected between said PBX and a user device, the PBX having an automatic call distribution subsystem which works in conjunction with a plurality of digital control telephone lines, the method comprising the steps of:

  • passing a telephone call from one of the trunk lines through the PBX and a selected one of the digital control telephone lines to a telephone set,monitoring said two-wire lines to detect whether or not at least one of said two-wire lines is idle,passing a call transfer command from said telephone set to said PBX after receipt of said telephone call by said telephone set and provided at least one of said two-wire lines is idle as determined by said step of monitoring, andtransferring said telephone call from said selected digital control telephone line to an available one of said two-wire lines in response to said call transfer command such that the telephone call is forwarded to said user device.

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