The PBX platform has been very stable for a while now and it's one of our fastest growing offerings. We're still working on polishing things up and fixing issues as they come up (which is happening less often lately) before we take it out of BETA. While it's stable, it's just not quite as polished as we'd like yet.

We also have a handful of features we're wrapping up to fill in some of the missing pieces. Some examples are a Dashboard (visually see all current calls, queue stats, reporting, etc), custom hold music, tighter mobile integration, etc.

We have a lot of development resources focused on PBX to constantly improve it.