1.1 Overview1.1.1 Establishing a VoIP Network with the Pure IP-PBXPanasonic Pure IP-PBX supports Panasonic KX-NT series IP proprietary telephones (IP-PTs), Panasonic IPsoftphones, and SIP (Session Initiation Protocol) Extensions (hardphones and softphones) for communicationon a Voice over Internet Protocol (VoIP) network. These IP telephones can be used as extensions of the PBXwhen the local office LAN is connected to other LANs at different locations.The Pure IP-PBX also enables VoIP communication with PBXs installed at different locations. Since thecommunication does not take place over conventional telephone network, the high cost of long distancecommunication is virtually eliminated.The following diagrams illustrate VoIP network with (i) a remote office LAN and (ii) another PBX installed atdifferent location.Note• Panasonic IP Cell Station (IP-CS) units are also supported by the Pure IP-PBX for communication ona VoIP network. For details, refer to the Quick Installation Guide for the IP-CS.• In this manual, the illustrations of the PBX are based on the KX-NCP500.(i) VoIP Network with Remote Office LANDHCP ServerSIP ExtensionExtn. 102IP-PTExtn. 101DHCP ServerRemote Office LANLocal Office LANRouterSwitchingHubPBXIP SoftphoneExtn. 103IP NetworkIP-PTExtn. 104 SwitchingHubIP SoftphoneExtn. 105RouterSIP ExtensionExtn. 1064 IP Networking Guide Document Version 2010-081.1.1 Establishing a VoIP Network with the Pure IP-PBX