Panasonic KX-TDA0480 Getting Started

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1.2 Network Devices and Numbering Plan8 Getting Started1.2.1 Network ApplicationQSIG Line Service InterfaceQSIG line service allows PBX to support communications with other company members in aprivate network where the PBX is included. Implementation of VoIP Gateway Cards providesa VoIP interface to employ QSIG line service between Hybrid IP-PBXs at different locations byusing IP network instead of conventional telephone networks.Types of IP NetworkThe VoIP Gateway Card's quality of performance depends on the type of network in use.Manageable networks in which static*1 IP addresses can be used provide better quality ofservice compared to unmanageable networks such as the Internet, where quality of service isnot guaranteed.FirewallA firewall protects the internal networks of an organisation against unauthorised penetrationfrom outside. When routing a VoIP network through a firewall, some performance degradationmay result. If for practical reasons you must route the network through a firewall, refer to "A2Firewalls" for more details.1.2.2 Numbering Plan ExampleThere are 2 methods to plan your numbering system as follows:This section provides the network numbering mechanism using the PBX Office Code method(see "A1 Numbering Plan Example Alternative" for the example using the Extension Numbermethod) based on the previous example diagram. Configure your network referring to thisexample.*1 Dynamic IP addressing (using DHCP/BOOTP) is not supported.Examples of recommended IP network• Digital Leased Line• IP-VPN• Frame RelayNot recommended• Internet(Delays and loss in data transmissioncan cause degradation in speechquality.)PBX Office CodemethodIn addition to the destination number, the caller dials the unique OfficeCode of the PBX to which the called party is connected. Therefore, eachPBX in the network can have the same extension numbering scheme.That is, for example, each PBX in the network can have an extensionwhose number is 201.ExtensionNumber methodThe caller dials only the destination number of the called party to callthrough PBXs at different locations (hence there are less digits to dial thanwith the PBX Office Code method). To employ the Extension Numbermethod, no 2 PBX can have extensions sharing the same number. Thatis, for example, if 1 PBX in the network has an extension whose numberis 201, no other PBX can have an extension with the same number (201).