Why do we occasionally get a 'system busy' message on headsets when no-one is actually talking at the time? What is it telling us? Are the frequencies too busy or does the system really think more than eight people are latched on at one time? Currently our system is configured to have four packs on the master station and nine packs on the secondary station. The packs getting the 'system busy' signal are on the master station...! It appears to occur at the outer fringes of the transmit range between the beltpack and base station or when the signal has been degraded severely. It happens before you hear the “out of range” prompt. This condition can also occur if the 2.4 GHz spectrum is congested by other 2.4 GHz devices .The beltpack will be able to receive audio from base but will be unable to talk back to the base. Technically the beltpack isn’t out of range but the signal has degraded to the point where two way communication has become unreliable.Reducing the congestion would be suggested by turning off unnecessary Wi-Fi 2.4 GHz devices such as Wi-Fi capable portable devices or other nonessential Wi-Fi equipment. It would also be advisable to review the location of the antennas, if users are regularly operating at the fringes of the coverage area then some antennas may need to relocated.