This scheme mainly USES the IP phone binding public phone number for calling and called functions, so as to realize in the absence of traditional telephone circuit resources, use of network resources can realize number allocation of telecommunication services, through the soft exchange system to manage the system of Internet telephony, gateway, and connected to the telecom operators to switch circuit relay gateway (gateway) landing, and then by means of the fixed-line operators on the switch number set, a part of the landline number through the switch Settings, set in the soft exchange system, and then by the soft exchange system will send it ordinary telephone number via IP address translation to the network on the phone, so as to establish a connection, called the network telephone,
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