D-Link DPH-80 User Manual page 31

Entered remote-upgrade key sequence, no response
You need to have the software files in TFTP server and the MGCP phone should be
configured with the correct TFTP server and file names.
Entered remote-upgrade key sequence, plays unidentified tone
The MGCP phone plays a tone during software download. The MGCP phone will restart
upon successful download.
Power out during remote upgrade
If anything goes wrong during the software upgrade, the phone will use the previous
existing software.
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