534 Appendix I TFTP ServerThe following information must be considered when planning for a TFTPServer:• The process for the IP Phone to check the version of firmware againstthe firmware on the TFTP Server takes a few seconds for a quietnetwork.• The IP Phone attempts to connect to the TFTP Server. If the TFTPServer is offline, unreachable, or no connection is made, the IP Phoneuses its existing version.• The firmware downloading process takes about 30 seconds.• The TFTP Server must be capable of supporting multiple TFTP sessions.• When the IP Phone makes a TFTP request, it uses filenames without afull path name. Therefore, firmware updates for the IP Phones must beinstalled on the root directory of the TFTP Server.When the firmware is uploaded to the TFTP Server, the files must beunzipped. Allow time for the TFTP Server to refresh. Monitor the TFTPServer for any errors. The TFTP Server can be located anywhere on thenetwork if the IP Phones have the subnet mask and default IP gatewayconfigured correctly. However, the IP Phone expects a response within twoseconds to any TFTP Server request. Therefore, the TFTP Server shouldnot be located, for example, at the other end of a slow WAN link.If too many IP Phones attempt to download new software simultaneously, itcan cause the downloads to slow down or return error messages. To reducethe number of retries and error messages, manage the download processby staggering the times the IP Phones download the firmware.Nortel has tested the following TFTP Servers. They are listed in order ofpreference:• Nortel TFTP Server (ONMS application)• 3COM TFTP Server• Pumpkin TFTP ServerPre-download checklistEnsure the following requirements are met before downloading firmware:• A LAN must be properly configured and operational.• The Nortel Telephony system must be connected to the network andcompletely operational.• A TFTP Server must be available on the network in order to load theappropriate firmware in the IP Phones.Nortel Communication Server 1000IP Phones FundamentalsNN43001-368 01.02 StandardRelease 5.0 20 June 2007Copyright © 2003–2007, Nortel Networks.
