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AltiWare ACM 5.1 Administration Manual 315
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H A P T E R
24
Network Configuration Guidelines for
VoIP
Real-time applications such as voice communications require a networking environment
that meets certain requirements to deliver and maintain good voice quality. Follow these
network configuration guidelines when using AltiWare’s VoIP features.
ISP/Intranet Quality of Service (QoS)
•
If you subscribe to the public IP network or use your own Intranet, make sure the
maximum network delay is less than 100 milliseconds.
•
Also, the typical packet loss rate should be less than 1 percent.
WAN Bandwidth
The following table lists bandwidth requirements for various transmission media with
different codecs and frame sizes. It assumes silence suppression is not turned on. (The
same table appears on page 324.)
•
The Jitter Buffer should be adjusted according to the bandwidth allocated to data
traffic. For example, a long Ethernet packet (approximately 1500 bytes) traversing
through a WAN which is allocated with 256 kbps of data traffic bandwidth will take
about 50 milliseconds. The Jitter Buffer value should be set to this WAN link
transmission delay plus the typical network jitter delay. To configure the Jitter
Buffer, in AltiEnterprise Manager (VoIP > Enterprise Network Management)
click the Codec button.