AltiGen comm ACM 5.1 manual Network Configuration Guidelines for AltiGen IP Phones

Chapter 24: Network Configuration Guidelines for VoIP

Network Configuration Guidelines for AltiGen IP Phones

The following guidelines (specific to AltiGen IP phones) should be taken into consideration before you configure your network for use with NAT.

•DHCP is recommended to reduce the risks for duplicating IP addresses. AltiWare ACC/ACM provides seamless support for AltiGen IP phones using dynamic IP addresses. Select Dynamic IP address for IP Extensions in the AltiWare Administrator’s Extension Configuration window.

•A switch is recommended at the corporate network, rather than a hub, for IP phone connection. This can reduce packet loss ratio.

•If DHCP is used in this configuration, the administrator will need to perform the following for the AltiGen IP phone:

1.Configure the DHCP server to assign a private network IP address for each phone based on the phone’s MAC address (printed on the label on the bottom of the IP phone).

2.Add the private IP address to AltiServ and the TFTP server.

Configuration Guidelines for NAT

Note: This section only applies to AltiGen IP phones or IPTalk integrated with AltiView/ AltiAgent.

The section discusses the configuration guidelines when AltiServ is behind NAT (Network Address Translation) and communication to AltiGen IP phones, IPTalk, or another AltiServ is over WAN. AltiGen SIP phones support NAT traversal, which does not require special settings on the NAT router at the remote site.

Due to H.323/SIP protocol, which puts the IP address information in the TCP/IP payload, the NAT router requires some H.323 protocol and SIP protocol implementation to correctly handle the H.323/SIP traffic and translate the private IP address into a public IP address. Not all NAT routers have this kind of implementation. If the NAT router does not support H.323/SIP, you need to check Enable SIP NAT support and Enable H323 NAT support in AltiEnterprise Manager, IP Networks tab.

The following sections illustrate a private network configuration and a VPN configuration.

For information on setting up VoIP traffic forwarding for NAT and configuring AltiServ behind NAT, see “Configuring AltiServ Behind NAT” on page 335.

Private Network Configuration Example

(AltiWare with private IP address and behind NAT)

Only the private IP address is used in a private network—the public router will not route the packet that has a private IP address as its destination. (All IP addresses beginning with 192.168.x.x, 10.x.x.x, or 172.16.x.x to 172.32.x.x are private IP addresses.)

AltiWare ACM 5.1 Administration Manual 317