I thnk the application is designed as follows:
In the Bell System when you call forward your calls to another number, there is a "reminder ring splash" that rings your phone when forwarded somewhere. Typically Bellcore R5 was applied in this instance. This served as a constant reminder that your calls were forwarded to another location so every time a call came in, it would give that momentary ring.
In the Bell System instance, in this "ring state", you were unable to answer the call but merely provided that friendly reminder.
Perhaps that is why ringer # 5 was set that was as a default and should not be used as a standard distinctive ring cadence?
Jyst my 2 cents.
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