If all system users have equal priority, the user that transmits first is in control until this person ceases transmitting and gives someone else a chance. It may be beneficial (or absolutely necessary) to give priority to one or two important users. Remember that an Interoperability System is tying together entire radio systems, not just individual radios.
This can be accomplished by being able to assign either TX Priority or Dispatch Priority to all system interfaces. (Also called PTT Priority or COR Priority).
Normally all interfaces are set to TX Priority. This means that if two or more radios or other 4-wire devices (e.g. a dispatch console) are cross-connected, whoever talks first is in control and no one else can be heard until this person stops talking (and releases the radio PTT).
If the DSP module associated with one user is set to Dispatch (COR) Priority, an unsquelch condition received at the Interoperability System from this console will override the other user’s control of the system. The dispatcher’s audio will be transmitted instead, or will be mixed with existing incoming audio from any other DSP module also set to Dispatch Priority.