Mitel Superset 4150 - Manual (Page 33)

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To respond to preemption:
z
If you are engaged in a call and hear a continuous preemption warning
tone, a call of higher precedence is attempting preemption. Hang up
immediately, wait for an MLPP ring, and then answer the telephone.
As you talk, the display indicates the priority of the call as well as the
duration of the call.
z
If you are engaged in a call and hear three seconds of preemption tone, it
means that the person you were talking to has been preempted. You
should hang up. You may place another call if required.