User guide

Chapter 24: Network Configuration Guidelines for VoIP
MAXCS ACC 6.5 Administration Manual 323
You must set up a VPN tunnel to connect the two private networks. The VPN setup
procedure may be complicated and is generally performed by a professional IT
technician.
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
configured 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
1
Linksys is for reference only. AltiGen has not certified this product or any other router at this time.
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