T2xP unicode (Chinese) display?

[conradwu]

I thought the phone (I have both T21P and T28P) was not capable of unicode characters, but today I visited someone else's office and it is certainly a T28P except the name being the carrier instead of Yealink.

It does Chinese characters on the screen, have I missed something in the settings or using the wrong firmware?

My phonebook is unicode but shows "????" on the phone screen.

Please advise!