Patent ID: 6882715

Claim:
An audio security system for a barrier entry communication system comprising: a) a movable security barrier that limits access to a restricted area to persons having appropriate authorization to enter the secured area; b) a barrier security apparatus operable to open said security barrier on activation after appropriate authorization; c) a first voice communication device located at said security barrier and whereby an individual at said security barrier desiring access to the restricted area can contact a location capable of granting authorization to enter the restricted area through said barrier using the public telephone system; d) a second voice communication device at a location within said restricted access area capable of granting authorization to enter, operatively connected to said first voice communication device using the public telephone system; e) a voice modification system available to said second voice communication device whereby a person at said second communication device when answering a call from said first voice communication device can modify the audio characteristics of an oral response and grant authorization to enter the secured area.