Altigen ACM 6.7 Administrator's Manual page 327

Setup
For the Branch office LAN:
IP Phone 3, IP Phone 4 and IP Phone 5
•
When configuring the remote IP phones—IP Phone 3, IP Phone 4, and IP Phone 5—
you should set up the AW address to use the MAXCS IP address.
For the VPN Tunnel between the Two Private Networks:
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 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)
Remote Secure Group:
(specifies the remote
network which can access
the VPN tunnel at the branch
office network)
Remote Security
Gateway:
(specifies the public IP
address of the remote
gateway which can access
the VPN tunnel at the branch
office)
1
Linksys is for reference only. AltiGen has not certified this product or any other router at this time.
Subnet IP:
192.168.1.0
(Corporate Network)
Subnet IP:
192.168.2.0
(Branch Office
Network)
63.224.32.34
(Router 2's public IP
Address
MAXCS ACM 6.7 Administration Manual 313
Configuration Guidelines for NAT
Subnet Mask:
255.255.255.0
Subnet Mask:
255.255.255.0
1
. Router