| 摘要 |
PURPOSE: To attain inexpensive communication service by discriminating whether or not a personal handyphone system(PHS) terminal is resident in a private network and connecting a caller terminal and the PHS terminal in the private network when the PHS terminal is resident so as to avoid the utility charge of a public PHS network. CONSTITUTION: When a wired terminal 8 or a member terminal 6 in a private network 1 makes a call to a visitor terminal 7, the terminal 8 or 6 dials a public PHS number of the terminal 7. A PBX 4 retrieves a position registration database 9 of the PBX 4 as to whether or not the public PHS number is a number in existence in the private network 1. When the public PHS number is in existence in the database 9, since the called terminal 7 is in existence in the private network 1, the PBX 4 makes a closing connection of the terminal 7 within the private network 1 not via the public PHS network. When the number is not in existence in the database 9, the PBX 4 makes connection to the public PHS network 3. Thus, when the visitor terminal 7 is in existence in the private network 1, since the connection is not through the public PHS network, the utility charge of the public PHS network is not required.
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