Hello... I am almost each day here, but without comments. I would comment something:
1 - PLEASE back with Groups in Presence/Status of Extensions. We have a lot of Clients with more Branches and only one Instance. Each Branch is in a Group. Today is a chaos in Status-List.
2 - Contacts - I fint (too) unnecessarily have Privat Contacs in 3CX, but is also not a problem. A filter (All contacts / Phone contacts / 3CX contacts) would perfect.
3 - Migration - We use Instance Manager und is needed +/- 10 minutes to upgrade ALL INSTANCES. We should be carefull with "Specials Instances" with Custom Templates, but they are exceptions (we have a Target of null exceptions until 2020).
4 - Voicemail in new App is really difficult. We wait for the next update.