1. A method for restricting access to a public telephone network using a telephone call management system, said method comprising the steps of: assigning a first identification number to each of a plurality of potential callers; recording a first voice print of at least one potential caller; storing said first voice print and said first identification number in a database; during each access attempt to said public telephone network by said potential caller: prompting said at least one potential caller to input a second identification number; recording a second voice print of said at least one potential caller; matching said first and second identification numbers; comparing said second voice print with said first voice print associated with said first identification number; granting said at least one potential caller access to said public telephone network to attempt to place a telephone call if said second voice print matches said first voice print; monitoring at least one conversation to detect the presence of a three-way call attempt; and recording at least one conversation between said at least one potential caller and a third-party remotely located from said at least one potential caller if said recording is permissible; and detecting the presence of predetermined keywords in audio of said at least one conversation.