Voice over IP (VoIP)
133
LAN DHCP Server
If the LAN already uses a DHCP server to configure workstation computers, there are
various options for correctly responding to VoIP system telephones’ DHCP, BOOTP and
TFTP requests. A comparatively simple approach is described here.
1. Configure the LAN’s DHCP server to ignore DHCP requests from the VoIP system
telephones. With a Linux DHCP server programme, you must, for example, include
the following lines in the system file “/etc/dhcpd.conf”:
group {
deny booting;
host 192.168.11.12 {
hardware ethernet 00:30:42:00:11:22;
}
}
Every DHCP service programme has similar options. You may need to reserve a
free IP address for each VoIP system telephone. You will find more details in your
DHCP service programme’s online help or handbook. The MAC address of all VoIP
system telephones always begins with 00:30:42.
2. Configure a fixed IP address for the OpenCom 100. To do this, call up the Configu-
rator and open the Network: LAN page. Click on the Change button.
3. Enter the current IP address configuration in IP address and Network mask.
Confirm with Apply.
4. Configure the OpenCom 100’s DHCP server to assign IP addresses. To do this, call
up the Configurator and open the Network: DHCP page. Click on the Change
button.
5. From Status, select the address assignment option. Confirm with Apply. The
DHCP page is re-displayed.
6. Add the configured VoIP system telephones to the list of IP addresses. Click on the
New button.
7. Enter the VoIP system telephone’s IP address and MAC address. Enter the IP
address reserved by the DHCP service programme. Confirm with Apply.
Restart the OpenCom 100 and all connected VoIP system telephones.
Tip: Configuring multiple VoIP terminals can be facilitated by using
dynamic address assignment (please refer to Dynamic Address
Assignment for Specific Devices starting on page 98).
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