| 摘要 |
PURPOSE:To allow a possessor of a portable telephone set to make a telephone call from anywhere by installing everywhere a portable telephone radio station connected to a wired communication exchange network. CONSTITUTION:An incoming telephone set 1 and a called party calling telephone set 4 are connected to an exchange station 6. When a call signal comes to an incoming telephone line terminal 2, a call connection exchange 3 connected to the terminal 2 and a called party call telephone line terminal 5 stores a call number, starts a radio call transmission station 8 via exchange stations 6, 7 to call a called party possessing a portable telephone set 9. The called party receiving the call sets a radio line between a portable telephone set radio station 10 connected to an exchange station 11 and the portable telephone set 9 to call the exchange 3 connected to the terminal 5. When an incoming call exists, the exchange 3 checks whether the number is a number of the called party stored or not, and when the call is an incoming call from the called party, a talking line with a call telephone set is constituted to make talking between a call telephone set and the portable telephone set 9. |
