Yealink SIP-T20 - Manual (Page 116)

User Guide for the SIP-T20P/SIP-T20 IP Phone
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2. Click Export to open file download window, and then save the file to your local
system.
To import the phone configurations via web user interface:
1. Click on Settings->Configuration.
2. Click Brower to locate a configuration file from your local system.
3. Click Import to import the configuration file.
Note
How to upgrade firmware?
To upgrade firmware via web user interface:
1. Click on Settings->Upgrade.
2. Click Browse to locate the firmware from your local system.
3. Click Upgrade to upgrade the firmware.
The web user interface prompts ―Firmware of the SIP Phone will be updated. It will
take 5 minutes to complete. Please don't power off!‖.
The file format of configuration file must be *.bin.