VoIP System Telephones
Voice over IP (VoIP)
189
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 Forum 5004/5008/5012. To do this,
call up the
Configurator
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 Forum 5004/5008/5012’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 Forum 5004/5008/5012 and all connected VoIP system
telephones.
