RELATED IDEAS
Mitel 480G - Add Extension to phone home screen
Testing the Mitel 480G phone enrolled with RingCentral.
With Mitel, the top bar on the home screen shows the user's extension. It does not with the RingCentral firmware. It is handy to see that at a glance.
It doesn't on the 69xx series phones either. The fix is to have RC put the extension number (instead of the name) as the line presence - but it can't be changed. There are a few workarounds but all of the are ugly...