I've seen both warn/chewed insulation and water cause phones to go off
hook.  Off hook is essentially a high resistance short between the two
wires.  It's easy to get a faulty pair to go off hook; it's not so easy
to make it dial 911 without a dialer.

-Mike

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Mark E. Skeels
> Sent: Thursday, August 16, 2007 9:56 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE]DSL Modem question
> 
> 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?
> 
> Mark
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