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Voice over IP (VoIP) VoIP System Telephones
75
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 regis-
tration.
5. The VoIP system telephone creates a TCP connection to the supplied IP-
address/port-number combination and sends a registration query. The
Aastra 800 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 commu-
nicated in the registration answer.
Aastra 6773ip
(OpenPhone 73 IP)
/ram/ip_tel/opi7x.cnt
Aastra 6775ip
(OpenPhone 75 IP)
/ram/ip_tel/opi7x.cnt
RFP 31/32/33/34/41/42 /ram/ip_tel/ip_rfp.cnt
Telephone type File name