PURPOSE: To provide the callback call reception method to a caller extension after emergency talking and the telephone exchange in which the caller extension receives a call and quick countermeasure is taken because of direct visit to a site on emergency when a callback comes from an emergency talking destination after emergency talking of dial number 110 or 119 or the like.

CONSTITUTION: In the case of external line call connection from an extension telephone set 3 of a private branch of exchange 1 for an emergency talking, at the acquisition of an office line trunk, a path number of the caller extension number and a trunk number are stored in an emergency talking caller extension number memory 8 of a main storage device. After the end of an emergency talking with the extension telephone set 3, at the arrival of a call to an office line trunk 5 by the callback from the emergency talking destination, the emergency talking caller extension number memory 8 of the main storage device 7 is accessed to read a caller extension number and a call reaches the read caller extension.