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The Avaya 4600 IP Telephones get useful application information from the TFTP server. The telephones also upgrade themselves using files stored on the TFTP server. While the Avaya 4600 Series IP Telephones can operate without a TFTP server once software has been downloaded, some functionality can be lost if the TFTP server is not available when they are reset. For further information, refer to DHCP and TFTP Servers and TFTP.
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