PRIVATE BRANCH EXCHANGE, IP EXTENSION TERMINAL, AND PRIVATE BRANCH EXCHANGE SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a private branch exchange, an IP extension terminal, and a private branch exchange system without requiring complicated operation or the like in order to prevent the tapping in voice communication on an IP network.

SOLUTION: Voice data are transmitted after deciding a UDP port number when transmitting/receiving the voice data on a LAN in between the private branch exchange 1 in the IP extension terminal 2 on the basis of its own telephone number and a telephone number of a calling destination. The voice data are exchanged after deciding a UDP port number when transmitting/receiving the voice data on the LAN similarly on the basis of the telephone numbers of the IP extension terminals 2 of a calling origin and the calling destination in the private branch exchange 1. Consequently, safety can be further enhanced compared with the case of executing communication with a fixed port number each time.

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