CALLING METHOD OF SIP PHONE IN PRIVATE INTERNET NETWORK

摘要

PURPOSE: A calling method of an SIP(Session Initiation Protocol) phone in a private Internet network is provided to apply an IP sharer to a VoIP environment, thereby enabling a call with a general phone connected to a PSTN and other IP phones existing in the PSTN by using one IP. CONSTITUTION: While using a fixed IP, a network checks an enable button of an NAT(Network Address Translation) configuration(a1), and sets an authorized IP assigned to an NAT(a2). If the network presses a save button(a3), an authorized IP value of the set IP NAT is converted into a 32-bit binary value in a VoIP telephone program, and the converted value is stored, then a variable value is set to TRUE(a4). If a call is made with a VoIP telephone, the variable value is used as an IP by a contact header and an RTP(Routing Table Protocol) connection address of an SDP(Session Description Protocol) body.