Hi, I see from each extension's forwarding rules under Phone is Busy, "If my phone is busy or unregistered, then:" Is there a way I can have one IVR set for 'busy' and another one for 'unregistered'?
The way the extension forwarding rules currently stand, there does not appear to be a way to differentiate between busy and not registered. You could always submit a feature suggestion for future versions. http://3cx.ideascale.com/