Just a tip from me if you are impatient: there are a number of programs on the market that support mobile
devices, at least through an optimized browser. For example, I use TRX-Manager, but there are others, such
as CommCat. This would require you to run a PC (which can be at the control site) with an interface to the RRC
and a separate VoIP software, such as Skype.
Of course, a "real" app from Microbit would be a better solution, but this solution works very well on a smartphone.
73,
Mitch DJ0QN / K7DX