Appendices140 Installation ManualA2 Numbering SystemsThe KX-TDA0480 network calling numbers are mapped to the IP addresses used in thenetwork. This mapping may be configured with an H.323 Gatekeeper device and/or within theKX-TDA0480’s internal DNS.DAT file.A2.1 Numbering Plan ExampleThe following sample network diagram shows the extension numberings, PBX Codes, andTrunk Access Codes.Sample network configurationIn this sample network, the following call can be made through IP network.• From an extension in each IP PBX to an extension in each IP PBX• From an extension in each IP PBX to PSTN in each IP PBXA2.2 Dialling ExamplesThe following examples describe the digits to be dialled when placing a call from variouslocations in the sample network. Trace the call paths listed here on the sample network diagramto better understand the sample numbering plan.Router PBXPSTN PSTNPSTNNew York Main OfficeLos Angels Branch OfficeSan Francisco Branch OfficeIP PBX (PBX Code: 51)IP PBX (PBX Code: 61)IP PBX(PBX Code: 21) (PBX Code: 27)IP PBX(Max: 10 digits)(Max: 10 digits)(Max: 10 digits)Networking orRouterIP NetworkRouterExtensions 60-69Extensions 200-299Extensions500-599 G3 FaxExtensions700-799Extensions 100-199IP TrunkAccess Code: 76PSTN TrunkAccess Code: 9PSTN TrunkAccess Code: 9PSTN TrunkAccess Code: 9IP TrunkAccess Code: 72IP TrunkAccess Code: 80