Patent ID: 8190178
Filing Date: 2012-05-29
Classification: H04M

Abstract:
1. A method for using a cellular phone which is registered to a base transceiver subsystem for a wireless office system (WOS) being connected to a private branch exchange for internal telephone exchange, has an internal telephone number, and operates as an internal phone within a cover area of the base transceiver subsystem for the WOS by inputting a dedicated special number and an extension number, the method comprising the steps of: preparing a conversion table including information for converting the dedicated special number to an external phone number of the private branch exchange; preparing a region for storing the extension number entered by a user following to the dedicated special number, storing the extension number in the region in response to input of the dedicated special number and the extension number; establishing a speech path, in a case where the cellular phone is located within the cover area of the base transceiver system, via said base transceiver subsystem for the WOS and said private branch exchange; and in a case where the cellular phone is located outside of the cover area of the base transceiver system for the WOS,