A1 VoIP Requirements
58
Getting Started
Are layer 2 or higher switches used?
Use of repeater hubs can increase the network load, and therefore may result in degradation
in speech quality.
To ensure the performance, it is strongly recommended that you use layer 2 or higher switches.
Are category 5 (CAT 5) cables used?
When connecting network devices, make sure to use CAT 5 cables. If other types of cables are
used, communications may not be carried out normally.
A1.4
QoS (Quality of Service)
Some routers permit the configuration of priority control features. This allows the router to give
higher priority to voice packets and lower the rate of loss and delays during transmissions,
hence improving speech quality. It is strongly recommended that you use this feature,
especially in networks where traffic is heavy.
Typically, a router identifies what packets to pass in priority by checking the value in the ToS
field of the header of IP packets. The VoIP Gateway Card has the ability to set the ToS field of
outgoing voice packets (see "2.2.3 Voice Communication Parameters" in the VoIP Gateway
Card Programming Guide). When the card is appropriately configured, the router can give
voice packets from the card higher priority.
Consult your network administrator when setting the ToS field, as the setting value must
conform to the router’s specifications.
Note
Some switches also permit the configuration of priority control features. For more
information, consult your network administrator.
*2
For the actual setting values, refer to "2.2.1 Network Parameters" in the VoIP Gateway
Card Programming Guide.
Summary of Contents for KX-TDA0484
Page 4: ...4 Getting Started...
Page 44: ...4 3 Programming the VoIP Gateway Card in the Chicago Office 44 Getting Started...
Page 50: ...5 2 Programming the PBX in the Chicago Office 50 Getting Started...
Page 51: ...Getting Started 51 Appendix A Guidance for VoIP Installation...
Page 61: ...Getting Started 61 Appendix B Alternative Numbering Plan Example...
Page 69: ...Getting Started 69 Appendix C Initialization of the VoIP Gateway Card...
Page 72: ...C1 Initializing the VoIP Gateway Card 72 Getting Started...
Page 73: ...Getting Started 73 Appendix D Using the KX TDA5480 KX TDA0484 and KX TDA0480 in One Network...
Page 75: ...D1 Considerations in Installation Getting Started 75...