| 摘要 |
PURPOSE:To prevent disabled incoming call regardless of idle state of a subscriber line by giving a line non-corresponding number other than a representative number to a terminal equipment. CONSTITUTION:A representative number Np and a line non-corresponding num ber Nm different from subscriber numbers N1-N4 are given to a specific telephone set 1-1 and an area corresponding to the line non-corresponding num ber Nm is provided to a busy display area 81 in a main storage device MM. When an incoming call selects the line non-correspondence number Nm, a termi nal identification device 72 of a central controller 7 references a busy display area 81, and when it is identified that the idle information IBm is in idle state, and any of idle information IB1-Ib4, e.g., IB1 is in idle state, the idle informa tion IBm, IB1 are brought in the block state, a call is incoming to a key tele phone set 2 via a subscriber line 3-1 and a terminal identification code of the telephone set 1-1 is transmitted. |
