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Automatic dialer for telephone network access control

  • US 4,447,676 A
  • Filed: 02/24/1983
  • Issued: 05/08/1984
  • Est. Priority Date: 02/24/1983
  • Status: Expired due to Fees
First Claim
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1. An automatic telephone dialer for use in accessing a long-distance telephone network, comprising:

  • (a) a memory having a plurality of locations, each location being suitable for storing an entry indicating a group of telephone numbers not accessible via the long-distance network;

    (b) means for comparing a telephone number being called with the entries in the memory and, responsive to such comparison, routing the call to the long-distance network if the number being called is not within a group of telephone numbers represented by the entries in the memory; and

    (c) means for writing into said memory an indication of a telephone number called on the long-distance network when that number is found to be inaccessible via that network, whereby the directory may be compiled in said memory in response to failed attempts to access the network.

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