NETWORK AND INHOUSE NETWORK

摘要

PROBLEM TO BE SOLVED: To allow a network to satisfy requirements of a telephone service where real time performance in essential when the network is overloaded because much traffic is in existence in the Internet used of a channel. SOLUTION: In this inhouse network 1 having a private branch exchange(PBX) 12, an Ethernet for communication between terminals, and an Internet telephony server(ITS) 13 that makes communication through an Internet/intra-net 3, when an Internet telephone call via the Internet/intra-net 3 is used for a call other than the inhouse network 1, the network 1 has a function of discriminating whether or not the Internet/intra-net 3 is overloaded. In the case that the function discriminates an overload state of the Internet/intra-net 3, the function sets the PBX 12 to regard as if a leased line trunk were busy. Then the PBX 12 directs the call to a public telephone network 2 not through the Internet/intra-net 3.