User guide

Chapter 24: Network Configuration Guidelines for VoIP
MAXCS ACC 6.7.1 Administration Manual 295
The following minimum guidelines need to be considered for setting up the VPN tunnel:
• WAN Bandwidth—should be greater than the aggregate of maximum VoIP session
bandwidth usage.
• QoS—if the IP WAN network provides QoS (Quality of Service), it should be config-
ured to honor VoIP RTP packet transmission.
An easy example for a VPN resolution is with the Linksys EtherFast VPN router
1
. Router
1 and Router 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
tunnel at the corporate
network)
Subnet IP:
192.168.1.0
(Corporate Network)
Subnet Mask:
255.255.255.0
Remote Secure Group:
(specifies the remote
network which can access
the VPN tunnel at the branch
office network)
Subnet IP:
192.168.2.0
(Branch Office
Network)
Subnet Mask:
255.255.255.0
Remote Security
Gateway:
(specifies the public IP
address of the remote
gateway which can access
the VPN tunnel at the branch
office)
63.224.32.34
(Router 2’s public IP
Address
1
Linksys is for reference only. AltiGen has not certified this product or any other router at this time.