VoIP System Telephones
190
Voice over IP (VoIP)
Tip:
Configuring multiple VoIP terminals can be facilitated by using
dynamic address assignment.
Start Procedure
It may sometimes be useful to understand a VoIP system telephone’s start
procedure. Examples:
●
A complex DHCP address assignment prevents the operation of the
Forum 5004/5008/5012’s DHCP server within the LAN.
●
A VoIP system should be operated with a non-broadcast-capable IP
connection. This may be an RAS connection, a VPN connection or another
type of routed connection.
An external DHCP server can also control a VoIP system telephone’s start
procedure. In this case, system software matching the type of VoIP system
telephone must be transferred via TFTP.
The file name is determined by the telephone type.
After the VoIP system telephone has been connected to the mains power
supply, the start procedure is as follows:
1.
The boot loader starts and shows the VoIP system telephone’s MAC
address in the display. A DHCP request is sent simultaneously via
broadcast on the 255.255.255.255 broadcast address.
2.
An IP address, network mask and the default gateway for the start
procedure are sent from the DHCP server. Via the “Next server” option, the
DHCP server also provides the TFTP server’s IP address and the operations
software’s file name. The DHCP server uses the MAC address to select the
operations software file which matches the type of device.
3.
The boot loader loads the approximately 2 MB operations software file
from the specified TFTP server. The TFTP server’s IP address and the file’s
name are shown in the display. The loaded operations software is started.
Telephone type
File name
Forum IPhone 525
Forum IPhone 535
/ram/ip_tel/opi7x.cnt
Forum Base DECT IP
/ram/ip_tel/ip_rfp.cnt
Forum Base DECT IP v2
/ram/ip_tel/ng_ip_rfp.cnt