TOA Electronics CP-66 - Manual (Page 87)

Highest Executive Priority
This function is available only for those stations specifically
programmed for this function, with programming station
No. 200. When the station called is busy, as indicated by
the busy or privacy tone, dialing
sends a priority tone. This priority tone is transmitted for a
few seconds and then the call is put through, terminating
the original conversation.
When the called station is busy or in the Conference mode
or during a paging call, this function allows forced interrup-
tion for priority conversation.
* When the party called through the conference function is
busy and it desirable to interrupt his conversation, dial
Priority
Tie-line
Busy Tone
Original Conversation
Priority Call
Conversation Over
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