Yealink SIP-T4X Provisioning Manual page 45

Ensure that the size of the ringtone file is no larger than that the phone supports.
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Ensure that the properties of the ringtone for the phone are correct.
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Ensure that the network is available and the root directory is right for downloading.
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Ensure that the ringtone file exists on the provisioning server.
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Why doesn't the phone update configurations?
Ensure that the configuration files are different from the last ones.
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Ensure that the phone has downloaded the configuration files.
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Ensure that the parameters are correctly set in the configuration files.
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Troubleshooting
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