Altigen AltiContact Manager Version 5.0, Administration Manual

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Configuration Guidelines for NAT
9-24 AltiContact Manager Administration Manual
VPN Network Configuration (Connecting to AltiWare with
VPN)
Figure 10. AltiWare with VPN
In a small branch office, there are more than one IP phones with private IP
addresses that require connection to AltiWare. Due to fact that NAT only
allows one IP phone behind it, a VPN solution can be used to meet this
requirement.
Figure 5 shows a network layout in which there are two private networks,
the corporate LAN and branch office LAN. The VPN tunnel connects the
two private networks such that the two networks access each other with a
private IP address.
In the corporate network, AltiWare and AltiGatekeeper are installed and
running on a host with private IP address 192.168.1.2. This gatekeeper
redirects requests from local IP phones and from remote IP phones through
VPN.
Both Router 1 and Router 2 are VPN-capable and compatible with each
other. (It is recommended that the routers come from same vendor.) A VPN
tunnel exists between these two routers. The local IP phones, IP Phone 1
and IP Phone 2, directly connect to the corporate network with private IP