Just tested it, made a successful 2 minute call.
I had an interesting issue after upgrading where all my HTEK phones would call themselves every 60 seconds. no call was recorded on the PBX, and the softphone never rang, very odd. ended up just adding the phones own extension to the blacklist locally to band-aid it for now.
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.