Yealink SIP-T2XP, Provisioning Manual

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Yealink IP Phones Auto provisioning Guide
46
Why doesn’t the phone download the ring tone?
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Ensure that the file format of the ring tone is *.wav.
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Ensure that the size of the ring tone file is no larger than that the phone supports.
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Ensure that the properties of the ring tone 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 ring tone file exists on the provisioning server.
Why doesn’t the phone update configurations?
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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.