Altigen AltiContact Manager Version 5.0 Administration Manual page 268

Configuration Guidelines for NAT
• WAN Bandwidth - should be greater than the aggregate of
maximum VoIP session bandwidth usage. Each G.711 codec
requires 17 Kbps and each G.723.1 codec requires 85 Kbps.
• QoS - if the IP WAN network provides QoS (Quality of Service), it
should be configured to honor VoIP RTP packet transmission.
An easy example for a VPN resolution is with the Linksys EtherFast VPN
1
router . Router 1 and Route 2 are routers supporting VPN. When
configuring these VPN routers, the following information is needed. (Also,
please refer to the Router's User Guide for more detailed information.)
Router 1's Setting
Local Secure Group:
(specifies the local network
which can access the VPN tun-
nel at the corporate network)
Remote Secure Group:
(specifies the remote network
which can access the VPN tun-
nel at the branch office net-
work)
Remote Security Gateway:
(specifies the public IP address
of the remote gateway which
can access the VPN tunnel at
the branch office)
Router 2's Setting
Router 2's public IP address should be a fixed IP address.
Local Secure Group:
(specifies the local private network in
the branch office, which can access
the corporate network through VPN)
Remote Secure Group:
(specifies the corporate network,
which can be accessed by stations in
this local private network through the
VPN tunnel)
1
Linksys is for reference only. AltiGen has not certified this product or any other
router at this time.
9-26 AltiContact Manager Administration Manual
Subnet IP:
192.168.1.0
(Corporate Network)
Subnet IP:
192.168.2.0
(Branch Office Net-
work)
63.224.32.34
(Router 2's public IP
Address
Subnet IP:
192.168.2.0
(Branch Office Net-
work)
Subnet IP:
192.168.1.0
(Corporate Network)
Subnet Mask:
255.255.255.0
Subnet Mask:
255.255.255.0
Subnet Mask:
255.255.255.0
Subnet Mask:
255.255.255.0