NONNRELEASING PREVENTION CONTROL SYSTEM IN ABSENCE TRANSFER

摘要

PURPOSE:To minimize troubles such as transfering an important incoming call and disposing of it by the absence process by giving an alarm of special tone if the subscriber should call even once when the register releasing operation is neglected. CONSTITUTION:When, after the absence transfer register, a subscriber SUB has returned from the transfered location and hooks off while the line is still registered, the central processor system gains access to the area where the terminal number of telephone rgistered with memory M is used as the address, identifys that the number is being absence transfered at that time, connects the line to service trunk SVT by route (1) of network NW, let the subscriber hear the special tone (example; 400Hz intermittent sound of 120 times/min.), indicating that the line is being registered for absence transfer, CC changes the connection to outgoing register trunk ORT by route (2) of NW and let the regular dial tone heard. Hereafter, the dial from SUB is same as the regular dial tone which is received by ORT and connected to the desired subscriber, attendant console, etc.