Quote:
Originally Posted by Station X
There was no CLI in those days so the operator would ask the caller for their number. A second operator would then dial that number and confirm the line was busy. They'd then used the "Trunk Offer" or TKO facility to listen in on the call.
TKO's original use was to enable the operator to offer a trunk call to a busy line.
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... at risk of having another post edited or deleted ...
Call me a cynic and I won't deny it; however, I have it on iron-clad authority that TKO was sometimes ( I'll leave the reader to guess how often ) used for less noble purposes than was its original intention ...!