I would look at x10 triggered switches. There are some command line tools 
you could call from an IVR. 
I did a lot of x10 development on windows back in the day. I have seen some 
things for linux as well.

http://www.heyu.org/

Bryant

----------------------------------------
 From: "C F" <[email protected]>
Sent: Monday, October 18, 2010 7:55 PM
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<[email protected]>
Subject: Re: [asterisk-users] Asterisk to switch on electric heaters 
remotely?

Ah Sandman http://sandman.com use a relay that goes onto an fxs port,
call that fxs port and you have a connection. Since that only work
momentary you will need a flip flop relay, the advantage is that by
calling it again you can turn it off.
Ring relay:
http://sandman.com/wizard.html#UniversalRingRelay
flip flop relay:
http://altronix.com/index.php?pid=2&model_num=RBR1224

On Mon, Oct 18, 2010 at 7:09 AM, Gilles <[email protected]> wrote:
> Hello
>
> I'm sure someone has already tried this: I use a couple of electric
> heaters to heat my office.
>
> I'd like to somehow connect them to Asterisk so that I could switch
> them on remotely by either calling the IVR or sending an e-mail to the
> Asterisk host, so that the room is warm when I get to the office :-)
>
> Any information appreciated.
>
> Thank you.
>
>
> --
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