User guide

Chapter 24: Network Configuration Guidelines for VoIP
MAXCS ACC 6.5 Administration Manual 321
Figure 1 shows a private network, 192.168.1.0, where MAXCS is installed and running
on a host with a private IP address 192.168.1.2.
Router 1 is a NAT router. The local IP phones—IP Phone 1 and IP Phone 2—use the
private IP addresses 192.168.1.100 and 192.168.1.101, respectively. There are two
remote IP phones: IP Phone 3 with a private IP address 192.168.2.100 connects to the
Internet via Router 2. Router 2 can also sit behind a DSL/Cable Modem.
Setup
For the Corporate LAN
• MAXCS
MAXCS is installed (private IP address 192.168.1.2). The public IP address of Router
2 should be configured as the IP address of this IP extension in MAXCS. If it is
changed dynamically, then assign a dynamic IP address configuration for that
extension.
• Router 1
Router 1 is a NAT router. You need to set up the H323/SIP port forwarding for this
NAT router from 169.254.56.169 to the private IP address of MAXCS 192.168.1.2.
For the Remote IP Phone Using NAT
• IP Phone 3
When configuring remote IP Phone 3, you should set up the MAXCS IP address to
Router 1’s public IP address — 169.254.56.169.
• Router 2
No special configuration is needed for Router 2. Also, more than one AltiGen SIP
phone can sit behind Router 2.
For an H.323 IP Call from Another MAXCS on the Internet
Another MAXCS can make an H.323 IP call to this MAXCS by calling the public IP address
of the MAXCS , which is 169.254.101.2.