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Joined: Nov 2018
Posts: 16
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OP
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Joined: Nov 2018
Posts: 16 |
Wire each card to a button on a set the way you would with any line card. The wire the CO T/R from one card to the other. When the first unit goes off hook, the second one will ring.
It was not uncommon to wire up two of those units inside a large plant to provide hot line communication from one location to another.
Sam Thanks I'll give it a try.
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