Altigen AltiWare OE Release 4.0 Getting Started Manual page 73

• When a small data application (e.g. one FTP transfer session) is
running across the same WAN as AltiWare IP, make sure bandwidth
is reserved for data traffic. An example would be, if you have 64 kbps
WAN link, you can run one G.723.1 session concurrently with one
FTP file transfer session, provided that the router fragments each TCP
packet to 500 bytes.
• 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 VoIP
Trunk Configuration section in Chapter 4 of the System Administration
Manual 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. - 49152-49159 (1 board)
- 49152 - (49151 + # of board + *8) (more than 1 board)
2. TCP Port 1720
Network Configuration Guidelines for VoIP
AltiWare OE 4.0 Getting Started Manual 49