| 摘要 |
A method of controlling free phone calls placed from within a secured premises through an institutional phone system generally includes assigning a unique access identifier to an individual caller upon entry into the secured premises; receiving a destination number from the individual caller within the secured premises, the destination number being associated with a telephone located outside the secured premises; determining if the destination number is a per se free number, and, if the destination number is not determined to be a per se free number: receiving the unique access identifier from the individual caller; validating the unique access identifier; and, if the unique access identifier is valid, processing a telephone call to the destination number.
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