320HD IP Phone
Administrator's Manual
46
Document #: LTRT-08107
3.10.3 Recovering Firmware
If the phone is powered off for some reason during the firmware upgrade process, the phone
becomes unusable. To recover the phone’s firmware, perform the procedure below.
¾
To recover the phone’s firmware:
1.
Ensure that your DHCP server supports Options 66 (TFTP server address) and 67 (firmware
file), and that these are configurable.
2.
Before connecting the phone, verify that the TFTP server is running and the firmware file for
recovery is located in the correct location.
3.
Connect your phone to the IP network, and then connect the phone to the power outlet;
a.
The phone sends a TFTP request to the IP address indicated in the DHCP Option 66
field to retrieve the firmware file indicated in the DHCP Option 67 field.
b.
In the DHCP Discover message, the phone sends its model name in the DHCP Option
77 field. The DHCP server, according to the phone model, sets the appropriate firmware
file name in the DHCP Option 67 field sent to the phone (e.g.
320HD_1.2.2_build_5.img).
c.
The phone then upgrades to the recovery firmware.
d.
After the firmware upgrade process completes, the phone boots up successfully.
Note:
In Recovery Mode, the phone is unable to communicate with a TFTP server
located on a Linux machine or any other operating system (OS) that is not
Microsoft Window XP.
Summary of Contents for 300HD Series
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Page 8: ...320HD IP Phone Administrator s Manual 8 Document LTRT 08107 Reader s Notes ...
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Page 109: ...Administrator s Manual 7 Specifications Version 1 4 109 July 2010 Reader s Notes ...
