Patent ID: 6307928
Filing Date: 2001-10-23
Classification: H04L,H04M,H04Q

Abstract:
A call-back controllable exchange accommodating a plurality of subscriber terminals, comprising:a call controller for controlling, upon receiving a call setting request signal from a subscriber terminal as a calling terminal to another subscriber terminal as a called terminal, to set a call connection from the calling terminal to the called terminal, on the basis of an identifier of the calling terminal and an identifier of the called terminal that are contained in the call setting request signal, according to a predetermined call setting sequence;a call-back controller for executing a call-back control, the call-back controller executing an additional sequence, including at least a process for generating a reverse direction call setting request signal and a process for transmitting the reverse direction call setting signal, to exchange relationship between the calling terminal and the called terminal, during execution of said predetermined call setting sequence;an attribute information table that stores an attribute information as to whether or not the subscriber terminal is a terminal allowed the call-back control, for each subscriber terminal; andthe call-back controller comprises a called terminal determining unit to determine whether or not the called terminal is a terminal allowed the call-back control on the basis of the attribute information of the attribute information table, and carries out the call-back control; when the called terminal determining unit determines that the called terminal is a terminal allowed the call-back control;a band information table that stores a band value used in setting a call between subscriber terminals; andthe call-back controller comprises a band information determining unit to determine whether or not a specific band value is set in the call setting request signal from the calling terminal, and carries out the call-back control by applying the band value stored on the band information table as a band value used between the calling terminal and the called terminal, when the called terminal determining unit determines that the called terminal is a terminal allowed the call-back control and the band information determining unit determines that the specific band value is set in the call setting request signal.