| 摘要 |
In order to make an IP telephone service available simply by connecting a PBX, for example, connected to a PSTN interface to IP telephone network without changing the numbering plan of the PBX if a call arrives at a line IF portion 101, an SIP processing portion 104 refers to a number storage portion 105, identifies the VoIP number corresponding to the PSTN number given to the call as the calling party number, converts the calling party number of the call to the identified VoIP number, and transmits the call through an IP network IF portion 102. Furthermore, if a call arrives at the IP network IF portion 102, the SIP processing portion 104 refers to the number storage portion 105, identifies the PSTN number corresponding to the VoIP number, which is the called party number of the call, converts the called party number of the call to the identified PSTN number, and transmits the call through the line IF portion 101.
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