Logo Issues; Why Does The Ip Phone Use Dob Format Logo File Instead Of Popular Bmp, Jpg And So On; Power And Startup Issues; Both Poe Cable And Power Adapter Is Connected To The Phone - Yealink SIP-T5 Series Administrator's Manual

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 con-
verting BMP format to DOB format are available.

Power and Startup Issues

Both PoE cable and power adapter is connected to the phone

The phones use the PoE preferentially.

The power LED indicator has no lights

If no lights appear on the IP phone when it is powered up, do one of the following:
Reboot your device.
l
Replace the power adapter.
l

The Phone screen is black

If the power LED indicator is on, the keypad is usable but the phone screen is black, please reboot your IP phone.

The IP phone always displays 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 phones.

Other Issues

The difference among user name, register name, and display name

Both user name and register name are defined by the server. User name identifies the account, while register name
matched with a password is for authentication purposes. The display name is the caller ID that will be displayed on
the callee's phone LCD screen. Server configurations may override the local ones.

On code and off code

They are codes that the IP phone sends to the server when a certain action takes place. On code is used to activate
a feature on the server side, while off code is used to deactivate a feature on the server side.
Troubleshooting Solutions
559