On Thu, 2007-08-16 at 11:55 -0500, Mark E. Skeels wrote:
> Can you guys think of any way a phone line could be induced to go off 
> hook via a stimulus external to the phone line (not electrically connected?

A shovel hitting the phone line in the ground?

A phone line is a current loop. To go "off hook" a certain amount of
current must flow through the line. This sort of configuration is pretty
much immune to most EMI. TTYL

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