Text-based diagnostic utilities 495In this document NAT refers to both IP port address mapping and IPaddress mapping (also known as NAPT). A NAT is used with or without aVirtual Private Network (VPN).The NAT Traversal feature supports only IP clients behind cone NAT types.Three types of cone NAT are: full cone, restricted cone, and port restrictedcone. NAT traversal is not compatible with symmetric NATs. If the IP Phoneis behind a Symmetric NAT, the LTPS unregisters the phone from the callserver (while remaining registered on the LTPS), and displays the followingmessage on the IP Phone display: Error! Symmetric NAT.For detailed information about the NAT Traversal feature, see IP LineFundamentals (NN43100-500).For information about accessing NAT information from an IP Phone, see"Set IP Information" (page 496).ATTENTIONNortel recommends partial DHCP configuration for IP Phones residing behinda NAT router unless the NAT router supports special configuration of the DHCPserver. For more information, see IP Line Fundamentals (NN43100-500).General InformationThe General Information menu displays information about the IP Phone.To access the General Information menu, press Services > TelephoneOptions > Set Information > General Information.The General Information menu displays the following information aboutthe IP Phone• Hardware ID• Terminal Type• Release Number• Manufacturer Code• Color Code• Set TN• Registered TN• EEPROM Data Validity• Set IP InformationFor further information about the Set IP Information menu option, see"Set IP Information" (page 496).• Ethernet InformationNortel Communication Server 1000IP Phones FundamentalsNN43001-368 01.02 StandardRelease 5.0 20 June 2007Copyright © 2003–2007, Nortel Networks.
