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4600 Series IP Telephone LAN Administrator’s Guide
Initialization Process
2-8
■ IP Address of the TFTP server
■ The subnet mask
■ IP Address of the router
You should administer the LAN so that every IP Telephone can access a DHCP server with the
above information.
The IP Telephone will not function without an IP address. The failure of a DHCP server at boot
time will leave all the affected voice terminals unusable. (Although it is possible for the user to
manually assign an IP address to an IP Telephone, when the DHCP server finally returns, the
telephone will never look for a DHCP server unless the static IP data is unassigned manually. In
addition, manual entry of IP data is an error-prone process.) It is therefore strongly
recommended that a DHCP server be available when the IP Telephone reboots.
A minimum of two DHCP servers is recommended for reliability.
The TFTP server provides the 4600 Series IP Telephone with a script file and, if appropriate, new
or updated application software (see Step 3, Telephone and TFTP Server under Initialization
Process below). In addition, you can edit the script file to customize telephone parameters for your
specific environment (see Administering Options for the 4600 Series IP Telephones
in Chapter 4,
Server Administration).
Initialization Process 2
The following is a high-level description of the information exchanged when the telephone is
initializing and registering. This description, which assumes all equipment is properly administered
ahead of time, may be helpful in explaining how the 4600 Series IP Telephones relate to the
routers and servers in your network.
Step 1: Telephone to Network 2
The telephone is appropriately installed and powered, and after a short initialization process, the
telephone identifies the LAN speed and sends a message out into the network, identifying itself
and requesting further information. A router in the network receives this message, and relays it to
the appropriate DHCP server.
Step 2: DHCP Server to Telephone 2
The DHCP server provides information to the telephone, as described in DHCP and TFTP Servers
on page 2-7. Among other data passed to the telephone is the IP address of the TFTP server,
which is crucial for the next step.