User guide

VoIP System Telephones132
Voice over IP (VoIP)
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.
4. The operations software sends a DHCP request on the
broadcast address 255.255.255.255. The VoIP system
telephone now receives an IP address, network mask and
default gateway for operations from the DHCP server. Using
“Option 43”, which is reserved for this purpose, the DHCP
server also provides the IP address of the communications
system and port number 8100 for registration.
5. The VoIP system telephone creates a TCP connection to the
supplied IP-address/port-number combination and sends a
registration query. The Forum 523/524 checks the MAC
Telephone type File name
Forum IPhone 520 /ram/ip_tel/opi63.cnt
Forum IPhone 530 /ram/ip_tel/opi65.cnt
Forum IPhone 525
Forum IPhone 535
/ram/ip_tel/opi7x.cnt
Forum Base DECT IP /ram/ip_tel/ip_rfp.cnt or
/ram/ip_tel/ng_ip_rfp32.cnt
Forum Base DECT IP v2 /ram/ip_tel/ng_ip_rfp.cnt