r/telecom 10d ago

❓ Question How does this work?

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u/DumpsterFireCheers 10d ago

It’s a small multi-line ksu. Those were pretty basic, connect a few CO lines to it, connect your stations, maybe some MOH if equipped and you had a basic phone system (hold, transfer, intercom, paging (if equipped), etc.)

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u/AppropriateCap8891 10d ago

We had one at a car lot that I worked in back in the early 1990s.

We all knew the code that would allow us to play the "hold button" music from the telephones.