353Nortel IP Phone 1140EContents This section contains the following topics:• "Introduction" (page 354)• "Description" (page 354)• "Components and functions" (page 355)• "Supported features" (page 359)• "Features not currently supported" (page 362)• "Display characteristics" (page 362)• "Cleaning the IP Phone display screen" (page 364)• "Local Tools menu password protection" (page 364)• "Key number assignments" (page 366)• "Package components" (page 366)• "Installation and configuration" (page 368)• "Full Duplex mode" (page 384)• "TFTP firmware upgrade " (page 385)• "Gratuitous Address Resolution Protocol Protection" (page 386)• "Extensible Authentication Protocol " (page 386)• "Bluetooth wireless technology" (page 386)• "Redeploying an IP Phone 1140E" (page 386)• "Replacing an IP Phone 1140E" (page 387)• "Removing an IP Phone 1140E from service" (page 388)Nortel Communication Server 1000IP Phones FundamentalsNN43001-368 02.01 StandardRelease 5.0 7 December 2007Copyright © 2003–2007, Nortel Networks.