Spectrum Administrative Master Administrative Masters are used to provide hands-free or private two-way voice communication with other Master Stations or Substations. An LCD call status display provides vital information such as the name and location of the calling party, status of the call, and priority level. Calls from substations are stacked in a queue by priority and may be answered or reviewed in any order. Substations can be programmed to report to one, several, or all Administrative Masters.