PURPOSE: To transfer various types of information on a calling subscriber by requesting the transfer of the information on the calling subscriber from a called subscriber after connecting the calling subscriber to the called subscriber.

CONSTITUTION: The calls of numbers "119", "110", etc. are connected to the attendant boards ATT at a fire station and a police station via trunks FPT for fire and police stations of the office exchange. When the calling is carried out again through the ATT, the FPT detects the recall signal and sends this information to a scanner SCN. Accordingly a central controller CC0 calls a calling subscriber SUB through a call signal trunk RGT and at the same time extracts the calling subscriber number, for example, from a memory MM based on the stored position of the SUB. This extracted subscriber number is transmitted through an MF signal transmitting trunk MFSND and then received by an MF signal receiver of the ATT to be displayed at a display device, etc.