Panasonic KX-TDA0480 Getting Started Manual

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5.1 Preventing ProblemsGetting Started 375.1.3 Priority ControlSome routers permit the configuration of priority control features. This allows the router to beconfigured to give higher priority to packets with high priority flags. The priority control featureshould be used when available.To configure, please refer to Section 4.9.1 Configure Gateway Units (KX-TDA0480) of IPGateway Card Installation Manual.5.1.4 Recovery Delay and Jitter BufferWhen voice signals are packetised and transmitted, individual packet can take different pathsthrough the network and arrive at the destination at varied timings (Jitter). The IP GatewayCard supports a secondary Jitter Buffer (max. 1920 ms) in which the packets are accumulatedtemporarily for processing to compensate for network congestion problems.To configure, please refer to 4.9.1 Configure Gateway Units (KX-TDA0480) of IP GatewayCard Installation Manual.5.1.5 Internet, Intranet, and Virtual Private Networks (VPN)Manageable networks (e.g., Intranet, Leased Lines, VPN) provide better quality of servicecompared to unmanageable networks such as the Internet.When implementing a VoIP network, care must be taken when assessing bandwidthrequirements. The IP Gateway Card uses 12 k per port when in use. Serialisation delays to theWAN are lower when higher bandwidths are used.When using the Internet/VPN, the ISP plays an important role in reducing the variable delay inthe WAN. A regional or national ISP will usually have better connectivity with the backbone andwill be able to guarantee greater service reliability than a local city ISP. When using VPNfacilities, delays may be introduced due to the additional processing time required forencryption processing.

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