Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
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Password Issues
How to restore the administrator password?
Factory reset can restore the original password. All custom settings will be overwritten after
reset.
Logo Issues
Why does the IP phone use DOB format logo file instead of popular
BMP, JPG and so on?
The IP phone only uses logo file in DOB format, as the DOB format file has a high compression
ratio (the size of the uncompressed file compared to that of the compressed file) and can be
stored in smaller space. Tools for converting BMP format to DOB format are available. For more
information, refer to Customizing a Logo Template File on page 283.
Power and Startup Issues
What will happen if I connect both PoE cable and power adapter?
Which has the higher priority?
IP phones use the PoE preferentially.
Why does the IP phone have no power?
If no lights appear on the IP phone when it is powered up, do one of the following:
Reboot your IP phone.
Replace the power adapter.
Why is the LCD screen black?
If the power indicator LED is on, the keypad is usable but the LCD screen is black, please reboot
your IP phone.
Why does the IP phone always display the Yealink logo?
If your IP phone does not boot, check if the provisioning server is accessible on the network
and a valid software firmware and valid configuration files are available. Try to use recovery
mode to get your phone ready. For more information on recovery mode, refer to
Recovery
Mode on Yealink IP phones
.
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