AltiGen MAXCS 7.0 Update 1 ACM Administration - Manual (Page 321)

Configuration Guidelines for NAT
MaxCS 7.5 Administration Manual 305
• Router 2 – No special configuration is needed for Router 2. Also, more than one AltiGen SIP phone can
sit behind Router 2.
Example Setup: SIP IP Call from Another MAXCS on the Internet
Another MAXCS can make an SIP IP call to this MAXCS by calling the MAXCS's public IP address, which is
169.254.101.2.
VPN Network Configuration Example
(Connecting to MAXCS with VPN)
Figure 173. MAXCS with VPN
In a multi-site configuration, VPN can be used to provide a secured tunnel between the remote sites and the
corporate site.
Figure 173, “MAXCS with VPN,” 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, MAXCS is installed on a host with private IP address 192.168.1.2.
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 address 192.168.1.100 and
192.168.1.101. And the three remote IP phones – IP Phone 3, IP Phone 4 and IP Phone 5 – connect to the
branch office network with private IP addresses 192.168.2.100, 192.168.2.101 and 192.168.2.102,
respectively.
Example Setup: Branch office LAN
• IP Phone 3, IP Phone 4 and IP Phone 5