AltiGen MAXCS 7.0 Update 1 ACM Administration - Manual (Page 318)

Chapter 25: Network Configuration Guidelines for VoIP
302 MaxCS 7.5 Administration Manual
Enabling VLAN
VLAN can be enabled and configured in the AltiGen IP phone: Network > Enable VLAN > Yes.
After enabling, set VID:Phone and VID:PCPort IDs.
It can also be configured in MaxAdmin in the AltiGen IP Phone Configuration screen, General tab.
WAN Bandwidth
Refer to the table on page 308 for bandwidth requirements for various transmission media with different codecs
and frame sizes.
• 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 Enter-
prise 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.
WAN Router Configuration
• The router that connects your LAN and the WAN should support priority queuing.
• Configure the router so that the IP/UDP packets being sent to and from an IP station have higher priority
than the packets generated by other stations on the same network. Consult your router manufacturer for
more information on setting up this configuration.
Firewall Configuration
If a firewall is used to protect your network access security, reconfigure the firewall to open up TCP and UDP
ports to the IP system’s IP address. The relevant ports are listed in the section Network Ports. This allows IP’s
voice to pass through the firewall freely.