Installation manual
Board Configuration
AltiWare OE System Installation & Administration Manual 149
Board Configuration
• 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. Refer to
“Triton VoIP Trunk Configuration” on page 181 for more information
on how to configure the Jitter Buffer.
• 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, e.g. 500 bytes.
WAN Router Configuration
The router which 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. Please consult your router manufacturer
for more information on setting up this configuration.
Firewall Configuration
Please note the following very important guidelines when working with a
firewall on your network:
• If a firewall is used to protect your network access security,
reconfigure the firewall to open up the following TCP and UDP ports
to the IP system’s IP address:
1. 49152 to 49159 for 1 board, or 49152 to N for more than 1 board
Note: N = 49152 + (62 * number of boards) - 1
2. TCP Port 1720
This allows IP’s voice and H.323 packets to pass through the firewall
freely. If the firewall supports H.323 protocol, configure the firewall
using H.323 instead of opening up the specific ports.
• Ensure that the rules to permit IP’s H.323 traffic are at the beginning
of your access filter list. This will minimize the delay of latency-
sensitive voice packets. This is ESPECIALLY important with long
access lists and/or slow routers.