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Apparatus for custom calling features in a telephone system

  • US 3,997,731 A
  • Filed: 04/14/1975
  • Issued: 12/14/1976
  • Est. Priority Date: 04/14/1975
  • Status: Expired due to Term
First Claim
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1. Apparatus for providing special service features of a first, or second or first and second type for a telephone system wherein said apparatus may be provided for a telephone station and line having access to said telephone system through an intermediate distributing interconnection, said apparatus including means insertable into said system at said interconnection to provide services to the line to which connected, said apparatus including a control circuit interfacing between said line and line equipment in said system, said control circuit including a plurality of control conductors, a first circuit for providing said first type of special sevice feature, a second circuit for providing said second type of service, and a third circuit for providing both said first and said second type of service, and plural conductors in each of said first, second and third circuits to be connected in the alternative to said control circuit conductors to provide type or types of service indicated by the connected first, second or third circuit.

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