Patent ID: 7463624
Filing Date: 2008-12-09
Classification: H04L,H04M

Abstract:
1. A main equipment used in a network telephone system including a plurality of telephone terminals connected to a communication network to transmit voice packets, the main equipment connecting the plurality of telephone terminals to one another through the communication network to cause the telephone terminals to communicate with each other, the main equipment comprising: a communication unit configured to transmit connection confirmation signals to the telephone terminals at different timings, respectively, and to monitor states of the telephone terminals, the connection confirmation signals defined by a communication protocol on the communication network, the connection confirmation signals used to confirm connection between the telephone terminals and the main equipment; and a detection unit that detects present telephone terminals when the telephone terminals send back a response signal in response to the transmission of the connection confirmation signals, wherein the communication unit only transmits the connection confirmation signals to telephone terminals that are in the idle state.