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The DHCP server provides the following information to the 4600 Series IP Telephone:
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. It is possible for the user to manually assign an IP address to an IP Telephone, but 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. If a DHCP server is not available at remote sites during WAN failures, the IP Telephone will be unavailable after a reboot.
A minimum of two DHCP servers are recommended for reliability. A DHCP server must be available at remote sites if IP Telephones are isolated from the central site DHCP server(s) due to WAN failures.
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). In addition, you can edit an associated settings file to customize telephone parameters for your specific environment (see Administering Options for the 4600 Series IP Telephones).
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