| 摘要 |
PURPOSE: To store a relatively few ISDN lines, to simultaneously make three calls or more and to easily extend the ISDN lines. CONSTITUTION: A cordless telephone slave set 20 is the one which is possible to be applied to a simple portable telephone system and performs radio communication with a cordless telephone master set 21. Each of the cordless telephone master set 21 has one S/T point interface which is applied in an ISDN basic interface. A control unit 22 having the S/T point interface of the number corresponding to the number of cordless telephone master sets 21 performs the control of making a speech path for the transmission request from the cordless telephone master set 21 and the incoming call request from an ISDN public network 23. |
