Phone screen security system

Claim 1

A phone screen security system for blocking unwanted incoming phone calls and unauthorized outgoing phone calls, comprising: a housing; outside connection means in said housing for connection with an outside phone line; pick up circuit means in said housing for detecting a ring signal on said outside phone line; voice synthesizer means in said housing for requesting a security code input from a caller on said outside phone line; relay means actuated by said pick up circuit means for connecting said voice synthesizer means to said outside phone line; programmable code detect means for comparing a tone signal from said outside phone line with a programmed security code; said code detect means actuated by said voice synthesizer means; timing circuit means connected to said code detect means and said pick up circuit means for disconnecting said outside phone line after a predetermined time interval if a correct security code is not detected; said code detect means actuating said voice synthesizer means to inform a caller of a correct security code input; line select relay means connected to a plurality of inside phone lines; relay means activated by said code detect means for connecting said outside phone line to said line select relay means; ringer means for sending a ring signal to one of said plurality of said inside phone lines; a power connection on said housing for connection with a conventional source of 120 VAC; transformer means in said housing for reducing said 120 VAC to 48 VAC; power supply means in said housing for dividing said 48 VAC into 24 VDC supply to said line select relay means and 96 VAC to said ringer means; a four position switch connected to said line select relay means; said switch having an OFF position in which said inside phone lines are connected to said outside phone lines; said switch having an AUTO position in which said inside phone lines are connected to said pick up circuit means and bypass said code detect means; said switch having a CODE position in which said inside phone lines are connected to said code detect means and a correct security code must be input to access said outside phone line; and said switch having a PROGRAM position which connects said inside phone lines for programming respective security codes into said programmable code detect means.