"With the switch turned on, it kills the phone completely. No incoming or outgoing anything.
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But can another phone, connected directly to the line, still make and answer calls? If so, then it's quite possible that you are not supposed to be able to use the phone. That would prevent you from answering/interrupting the line when the macine is supposed to do it. Phone companies used to try to make stuff fool-proof to use and sometimes went the proverbial 'mile too far'. John C.
