Yes, I want to install a relay inside the telephone set to make on-hook dialing similar to 4A speakerphone. There is enough space inside on the buzzer place (second gong of the bell). Problem could be to select relay with proper make before brake sequence to avoid false hold condition. I will have 18VAC to power relay anyway on spare pair of 50 pair cable (needed to power 106A loudspeakers). I have unfortunately no exclusion kit on any of my sets.
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