Wireless: I get a "system busy" prompt when we try to talk from a beltpack on a DX beltpack.
There are a couple of reasons for a system busy prompt. The first one would be because you have exceeded the talk back path capacity of the base. The DX100, DX200, DX210, DX300, DX410 have a maximum limit of 4 wireless talk back paths. The 5th user will have to wait until one of the first come first serve 4 user unlatches from one of the talk back paths. If the DX210, DX300, DX410 is in dual mode the talk back paths are reduced to a 3 max limit.
Other reasons could be degraded RF transmission due to multi path conditions or being too far from the base.