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Timeline for Intercom from old corded telephones

Current License: CC BY-SA 4.0

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Feb 2 at 14:01 comment added callmemac Amazon sells rj11 crossover cables which could be an explanation. my earlier quandary... a wire has 2 ends and if you cut it, you have 4 ends to connect.
Feb 1 at 17:08 comment added Annette Gates One end of the left-side Red wire is attached to the wire labeled "G" which is connected to the battery negative terminal. The other end of the Red wire is attached to the wire labeled "R" which is connected to the battery positive terminal and the switch and buzzer in parallel. This circuit works. I can talk and listen on both phones and both switches activate the buzzer on the other end. What I don't understand is how the Red and Green are being connected between the two jacks via the 4-wire modular phone cable.
Feb 1 at 16:40 history edited Voltage Spike CC BY-SA 4.0
Use proper caps and grammer rules
S Feb 1 at 16:27 review First answers
Feb 1 at 16:40
S Feb 1 at 16:27 history answered callmemac CC BY-SA 4.0