@wardmundy have you looked at this phone in a while? The firmware now with a beta of 1.0.9.60 is much advanced over where it used to be. I especially like the Monitored Call Parking where you can park a call to a specific parking slot. The knock I have now is that in a busy environment, people want to know who is parked on slot 1 vs. 2, etc.
I'd love (IE Pay for) the ability for these phones to have the visual call park that was once done on Yealink. Would you be willing to see if that code will be able to work yet on them?