Nortel 2033 Installation And Operation Manual page 571

Appendix H: TFTP Server
Introduction
TFTP Server planning
A Trivial File Transfer Protocol (TFTP) Server may be required in an
IP Telephony system to distribute firmware to IP Phones. The TFTP Server
can reside on a subnet other than the Call Server and can be located on either
side of the firewall.
CAUTION
TFTP firmware download does not work when the
IP Audio Conference Phone 2033 is behind a NAT Server.
The TFTP Server holds the firmware for updating the IP Phones. Assuming
the IP address for the TFTP Server has been configured on the IP Phone, each
time the IP Phone is powered on, rebooted, or is manually reset, the IP Phone
checks the version of firmware against the version of firmware on the TFTP
Server. If the versions are different, the IP Phone downloads the new
firmware from the TFTP Server.
The following information must be considered when planning for a TFTP
Server:
• The process for the IP Phone to check the version of firmware against the
firmware on the TFTP Server takes a few seconds for a quiet network.
IP Phones Description, Installation, and Operation
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