EXTENSION CALL CONTROLLER AND BUSINESS PLACE MOBILE PHONE SYSTEM

PROBLEM TO BE SOLVED: To provide an easily maintainable extension call controller and a business place mobile phone system capable of performing speech with the portable terminal and fixed terminal of another business place based on an extension number. SOLUTION: This extension call controller arranged in each business place specifies an SS7 signal station code assigned to the extension call controller of an incoming destination business place based on a dial number showing a call connection request message received from a terminal in the business place, and transmits the SS7 call connection request message(LAM) including an extension number as incoming number information to a public portable telephone network. Thus, it is possible to realize call connection between business places connected through the public portable telephone network in this business office mobile phone system. COPYRIGHT: (C)2006,JPO&NCIPI