VoIP System Telephones
Voice over IP (VoIP)
115
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 address sent with the registration and
confirms the registration request if the VoIP system telephone is listed in
the menu
Telephony: Devices: VoIP Phones
. The keep-alive time, port
number (8101) for telephony signalling and the value to use for the TOS
byte are also communicated in the registration answer.
6.
The VoIP system telephone creates a second TCP connection using the
signalling port number 8101 and sends a registration.
7.
Extra connections are created using the IP protocol RTP (“Realtime
Transport Protocol”) for call data when a call is created. For calls between
two VoIP system telephones, port numbers above 8200 are used. For
transmission to a Media Gateway card, a port in the range 1024 – 1087 is
used.
If you wish to operate a VoIP system telephone via a routed IP connection (for
example VPN or RAS) it may be necessary to configure an external DHCP
server accordingly. Please note the selection of the codec and keep-alive time
for RAS connections. This can be done by selecting the default profile
RAS
in
the
Telephony: Devices: VoIP Phones
for the VoIP system telephone. The
operations software provided via TFTP must match the type of device and
Summary of Contents for forum 523
Page 1: ...Forum 523 524 Mounting and Commissioning Manual ...
Page 10: ...8 ...
