Panasonic KX-TDA0480 Getting Started page 46

A3 Optimising Performance
provide the VoIP Gateway Card with clear transmission paths.
VoIP Gateway Card Location
One preventative measure is to install the VoIP Gateway Card so that the number of
transmission hops is kept to a minimum. In the figure below, the VoIP Gateway Card is located
as close to the WAN interface as possible.
Too many HOPS!
A3.3 Priority Control
Some routers permit the configuration of priority control features. This allows the router to be
configured to give higher priority to packets with high priority flags. The priority control feature
should be used when available.
To configure, refer to "4.9.1 Configure Gateway Units (KX-TDA0480)" in the VoIP Gateway
Card Installation Manual.
A3.4 Recovery Delay and Jitter Buffer
When voice signals are packetised and transmitted, individual packet can take different paths
through the network and arrive at the destination at varied timings (Jitter). The VoIP Gateway
Card supports a secondary Jitter Buffer (max. 1920 ms) in which the packets are accumulated
temporarily for processing to compensate for network congestion problems.
To configure, refer to "4.9.1 Configure Gateway Units (KX-TDA0480)" in the VoIP Gateway
Card Installation Manual.
A3.5 Internet, Intranet, and Virtual Private Networks (VPN)
Manageable networks (e.g., Intranet, Leased Lines, VPN) provide better quality of service
compared to unmanageable networks such as the Internet.
46 Getting Started
Router
Switch
Switch
Hub
Hybrid IP-PBX
Better!
(IP PBX located nearest WAN access point)
Router
Switch
Switch
Hub
Hybrid IP-PBX