Yealink IP phone - lack of SpeedDial, lack of directory or teams contacts
The current desktop phones (I only have Yealink 56a) don't support personal outlook/teams contacts or a way to use speed dials on the display.
A phone without this function is useless in daily use, it should have the same functionality as the Windows or mobile version in terms of contact management, also having a central directory option to include multiple corporate directories (e.g. a repository in O365 to have phone books) would help
Aaron Cooper commented
same issue with all teams certified phones.