Voice over IP (VoIP) VoIP System Telephones
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call between two VoIP system telephones, call data is exchanged directly
between the two VoIP system telephones.
■ During the device’s start procedure, the IP address is configured and the device
software is requested via the DHCP and TFTP network protocols.
9.4.2 VoIP System Telephone Configuration
The VoIP system telephones OpenPhone 63IP and OpenPhone65IP obtain the
required IP address configuration and operating software via the DHCP, BOOTP
and TFTP IP protocols. After the power supply is assured, the device’s internal boot
loader is started which controls the further start procedure.
Standard operating procedure is to contact the OpenCom 100’s DHCP server so
that the start procedure can be concluded without problems. To register a new
VoIP system telephone, proceed as follows:
1. Temporarily remove the VoIP system telephone’s ethernet connection. Switch
on the VoIP system telephone’s power supply. Note the MAC address shown in
the display, for instance “MAC: 00:30:42:00:00:00”. Switch off the power supply.
2. In the Configurator, open the PBX Configuration: Devices: VoIP Phones
page. Click on the New button.
3. Select the VoIP system telephone’s Type and enter the previously noted MAC
address. Assign a Name and Phone No. Confirm with Apply.
4. Connect the ethernet connection with the VoIP system telephone’s RJ45 con-
nector. Switch on the power supply. Verify the correct start procedure on the
display.
9.4.3 LAN DHCP Server
If the LAN already uses a DHCP server to configure workplace 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 program, you must, for example,
include the following lines in the system file “/etc/dhcpd.conf”:
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