HOLD-A-CALL

MULTI-PURPOSE ATTACHMENT FOR A TELEPHONE INSTRUMENT FOR USE IN A SINGLE OR MULTIPLE LINE SYSTEM, SAID ATTACHMENT CAN BE SELECTIVELY USED TO PLACE AN INCOMING CALL ON HOLD, WITH OR WITHOUT MUSICAL BACKGROUND; TO PREVENT DISCONNECTION OF AN INCOMING CALL; TO BUSY-OUT OR INSULATE AGAINST THE ANNOYING INTRUSION OF THE TELEPHONE BELL RING OR ELIMINATE AN INCOMING CALL TO PREVENT THE TIE-UP OF A LINE; TO DETECT EAVESDROPPING ON A LINE; TO FREE THE TELEPHONE FOR IMMEDIATE USE BY SIGNALLING A PARTY ON AN EXTENSION LINE; TO DETERMINE WHETHER A PAGED PARTY TO AN INCOMING CALL HAS RESPONDED TO THE PAGE; AND TO CHECK THE STATUS OF THE LINE, WHETHER IN USE, BUSY-OUT, HOLD OR FREE