FORCED DISCONNECTING METHOD OF EXCLUSIVE LINE

PURPOSE:To design to be efficient in use of an exlusive line by emitting an advanced warning tone of a forced disconnection after lapse of a specified time from the beginning of a dial connection talking and disconnecting the talking circuit forcibly. CONSTITUTION:As shown in diagram A, the dial connection is made from a extension telephone TEL to an exclusive trunk TRK. Talking starts according to their party's response, and then talking time is counted. In diagram B, when the specified time passes after start of talking, an advanced warning tone of forced disconnection is emitted from a tone trunk TOT to the telephone TEL to give advanced warning to disconnect forciblly. In diagram C after emitting an advanced warning tone SST, as a specified time passes, a communication link between telephone TEL and trunk TRK is disconnected forcibly, and reorder tone ROT is emitted to the telephone TEL to complete the forced disconnection of dial connection talking by the exclusive line.