1.1 Overview1.1.1 Establishing a VoIP Network with the Pure IP-PBXPanasonic KX-NCP500/KX-NCP1000 Pure IP-PBX supports Panasonic KX-NT series IP proprietarytelephones (IP-PTs), Panasonic IP softphones, and SIP (Session Initiation Protocol) Extensions (hardphonesand softphones) for communication on a Voice over Internet Protocol (VoIP) network. These IP telephonescan be used as extensions of the PBX when the local office LAN is connected to other LANs at differentlocations.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.NotePanasonic IP Cell Station (IP-CS) units are also supported by the Pure IP-PBX for communication on aVoIP network. For details, refer to the Quick Installation Guide for the IP-CS.(i) VoIP Network with Remote Office LANDHCP ServerSIP ExtensionExtn. 102IP-PTExtn. 101DHCP ServerRemote Office LANLocal Office LANRouterSwitchingHubPBXIP SoftphoneEtxn. 103IP NetworkIP-PTExtn. 104 SwitchingHubIP SoftphoneExtn. 105RouterSIP ExtensionExtn. 1064 IP Networking Guide Document Version 2009-121.1.1 Establishing a VoIP Network with the Pure IP-PBX