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Network telephone system and main apparatus and telephone terminals used in the network telephone system
Network telephone system and main apparatus and telephone terminals used in the network telephone system
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机译:网络电话系统以及网络电话系统中使用的主要设备和电话终端
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摘要
A main equipment is used in a network telephone system including telephone terminals and the main equipment. The telephone terminals are connected to a communication network to transmit voice packets. The main equipment connects the telephone terminals to one another through the communication network to cause the telephone terminals to communicate with each other. The main equipment includes a communication unit and a detection unit. The communication unit transmits connection confirmation signals to the telephone terminals at different timings, respectively. The connection confirmation signals are defined by a communication protocol on the communication network. The connection confirmation signals are used to confirm connection between the telephone terminals and the main equipment. The detection unit detects presence of one telephone terminal when the one telephone terminal sends back a response signal in response to the transmission of the connection confirmation signals.
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