Altigen AltiContact Manager Version 5.0A Administration Manual page 273

VoIP Configuration
Private and Public Network Configuration (AltiWare with Both
Private and Public IP Addresses)
Figure 9. AltiWare on Multi-Homed Host
In the case of insufficient public IP addresses for local IP phones, IP phones
can be located in a private network. With private IP addresses assigned,
when assigning two IP addresses (one public and one private) to AltiWare,
NAT is not required in the local network.
Figure 4 shows this network layout, where the AltiWare and
AltiGatekeeper are installed and running on a multi-homed host with
private IP address 192.168.1.2 and public IP address 169.254.101.2.
IP Phone 1 uses the private IP address 192.168.1.100 and IP Phone 2 uses
the public IP address 169.254.101.100. There are two remote IP phones. IP
Phone 3 with private IP address 192.168.2.100 connects to the Internet via
the Router 2, which must also support NAT. Router 2 can also sit behind a
DSL/Cable Modem. Another remote IP phone one, IP Phone 4, with a
public IP address 202.101.54.61, connects to the Internet directly.
Setup
For the Corporate LAN:
AltiContact Manager Administration Manual 9-21