Altigen ACC 6.7, Administration Manual

Page: 313 / 462

Chapter 24: Network Configuration Guidelines for VoIP
MAXCS ACC 6.7 Administration Manual 299
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
Please note the following 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 TCP and UDP ports to the IP system’s IP address. The relevant ports are
listed in Appendix C “Network Ports” on page 431. 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.
Network Using NAT
If you plan to connect to your AltiServ system via the Internet and your router or
Internet access provider is using Network Address Translation (NAT), please note that
most NAT implementations
DO NOT support H.323.
•
You are probably using NAT if both of the following conditions apply:
–
Your AltiContact Center server's IP address matches any of the following numbers
(where x is any number from 0-255):
•
10.x.x.x
• 172.16.x.x to 172.32.x.x
•
192.168.x.x
– You are able to connect to the Internet directly without using a proxy server.
•
Contact your router/firewall vendor to obtain a software update for your networking
equipment, or obtain routable address space from your Internet provider. If you are
unsure whether or not you are using NAT, contact your router/firewall vendor or
Internet provider.
Network Configuration Guidelines for AltiGen IP
Phones
The following guidelines (specific to AltiGen IP phones) should be taken into
consideration before you configure your network for use with NAT.
•
DHCP is recommended to reduce the risks for duplicating IP addresses. MAXCS ACC/
ACM provides seamless support for AltiGen IP phones using dynamic IP addresses.
Select
Dynamic IP address for IP Extensions in the MaxAdmin’s Extension
Configuration window.
• A switch is required; VoIP quality can be adversely affected if a hub is used.