Configuring IP Telephony 159■ For the 2101 Basic Telephone, press the Message button:For detailed instructions on how to use the LUI utility, see the NBXAdministrator’s Guide.AutomaticallyConfiguringTelephone IP SettingsWhen you connect a 3Com Telephone to a network, it searches for aDHCP server. If the telephone is on the same subnet as the NCP, thetelephone receives the following configuration information from theNCP:■ The IP settings (IP address, subnet mask, and default gateway address)for the telephone to use■ The IP address of the NCPThe telephone then stops searching for a DHCP sever.If a telephone is on a different subnet than the NCP and a DHCP serverprovides IP settings to the telephone, the telephone cannot communicatewith the NCP until it has the NCP IP address. There are two methods ofproviding the NCP IP address to the telephone:■ Manually configure the NCP IP address into the telephone using thetelephone LUI utility. See “Manually Configuring Telephone IPSettings” on page 157.■ Provide the IP address to the telephone using DHCP option 184. For anexample of how to configure option 184 on a DHCP server, seeAppendix C, “Configuring Option 184 on a Windows 2000 DHCPServer,” in the NBX Administrator’s Guide.The methods for configuring special options vary depending on the DHCPserver, and the example in the NBX Administrator’s Guide may not applydirectly to your DHCP server. For assistance, contact your networkadministrator, the vendor of the DHCP server, or a qualified 3Com servicerepresentative.Configuring AnalogLine Card PortsTypically, your analog line card ports reside on the same subnetwork asthe NCP. If you use IP On-the-Fly, or if you use Standard IP with DHCP, IPconfiguration is automatic. Verify that your server has enough addresses.However, if you are using Standard IP without DHCP, you must manuallyconfigure the IP settings for each line card port.
