Other solutions
Simply put, if you got here because you're looking for some other products, here's a short list from other frustrated users for you to explore.
VitalPBX
Vodia
FusionPBX
Wildix
Bicom PBXWare
Ivoz
Issabel
Crexendo (Netsapiens)
Yeastar
On Facebook
UCaaS Solution Providers (https://www.facebook.com/groups/793526008377000)
probably not any group with 3CX in the name...Â