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Context-dependent call-feature selection

  • US 5,289,535 A
  • Filed: 10/31/1991
  • Issued: 02/22/1994
  • Est. Priority Date: 10/31/1991
  • Status: Expired due to Term
First Claim
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1. A call processing arrangement for a telecommunications system having a plurality of user terminals and where users of the sytem input individual ones of a plurality of feature access codes via the plurality of user terminals to request individual ones of a plurality of telecommunications features, comprising:

  • a plurality of feature modules each for providing a corresponding telecommunications feature when invoked;

    means responsive to receipt of any one of the plurality of feature access codes from a user terminal for determining a context in which the telecommunications feature corresponding to the received feature access code is being requested;

    means responsive to receipt of a telecommunications-control symbol-sequence including the one of the plurality of feature access codes from the user terminal, for deriving a virtual node-point identifier (VNI) from entire said received symbol sequence;

    means for selecting and invoking one of the plurality of feature modules based on both the derived VNI and the determined context; and

    means responsive to the determined context for selecting and invoking the feature module corresponding to the feature that corresponds to the received code in response to the determined context being a valid context for the feature corresponding to the received feature access code and for selecting and invoking a feature-denial module in response to the determined context being an invalid context for the feature that corresponds to the received feature access code.

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