Re: REN, Resistors &c.
If the answering machine has a ringing detector which relies on a reverse-biased Zener diode going conductive, then it's conceivable that a high-REN phone in parallel with it could pull the voltage down just too low for the Zener diode to start conducting. It probably will impose some additional loading of its own, just to guard against false positives from noise on the line.
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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