I am also wanting to be able to remotely trigger the sprinklers - some are several hundred feet from the house. I don't have the net on my phone so was thinking of using something like VOCP (linux) - an IVRS that can be set up with menus using DTMF. I have a modem that works (no minor feat) but DTMF detection doesn't seem very consistent. I need to do a bit more testing but I think I will have to go to something like the SPA3102 with asterisk or more low level code like multimon that uses the soundcard and can decode DTMF. If anyone has done anything like this I would like to hear about it. I would rather not reinvent the wheel...