PURPOSE: To execute an operation of a hunting object slave number of a representative expansion table by blocking and releasing an optional part of a representative line or all lines by operating a telephone set of a representative subscriber.

CONSTITUTION: When the reception and accumulation of 5 digits of an additional dial from a calling subscriber is ended, an SRRS sends out an act bit ACT to an AXS side. When the AXS detects the ACT through a scanner SCN, various information DATA of a calling subscriber's telephone number ID accumulated in the SPRS, 4 digits of start and end old numbers, and 1 digit of an identification number is additionally received by the SCN. The AXS side can execute both an operation for excluding a designated slave number from a hunting object and an operation for putting it back, by rewriting a representative expansion table of an incoming translation table of a representative subscriber, based on the DATA. After said processing is ended, when a cutting instruction DIS is sent out to an SPRT through an RDV from the AXS, the SPRT sends out a completion sound CPT to the calling subscriber.