Altigen ACC 6.7, Administration Manual

Page: 312 / 462

Chapter 24: Network Configuration Guidelines for VoIP
298 MAXCS ACC 6.7 Administration Manual
Enabling VLAN
VLAN can be enabled and configured in the IP phone: Network > Enable VLAN > Yes .
After enabling, set VID:Phone and VID:PCPort IDs.
It can also be configured in MaxAdmin in the IP Phone Configuration screen, General
tab.
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 306.)
• 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 Enterprise Manager (
VoIP > Enterprise Network Management ) click
the Codec button.
• If you have heavier data applications running concurrently, the bandwidth reserved
for data traffic should be increased.
• If your router supports multilink or TCP fragmentation, configure your WAN router
to user smaller packet sizes, for example, 500 bytes.