Altigen AltiWare ACM 5.1, Administration Manual

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Chapter 24: Network Configuration Guidelines for VoIP
320 AltiWare ACM 5.1 Administration Manual
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 AltiServ’s 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. 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 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:
255.255.255.0A
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:
255.255.255.0A
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