Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
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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.
Power and Startup Issues
Both PoE cable and power adapter is connected to the phone
IP phones use the PoE preferentially.
The IP phone has no power
If no lights appear on the IP phone when it is powered up, do one of the following:
l Reboot your IP phone.
l Replace the power adapter.
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 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 firm-
ware and valid configuration files are available. Try to use recovery mode to get your phone ready. For more inform-
ation on recovery mode, refer to Recovery Mode on Yealink IP 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.
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