RJ 11 Port Access

I was wondering if there was a good way to access the RJ 11 port in the back of my laptop. I just want to get a sensor reading (either a 1 or 0) and need a simple way to do that.
In Windows you have to go though the HAL so no direct access to hardware. Dunno if it's more/less than what you need but you could check out the TAPI API here: http://msdn.microsoft.com/en-us/library/windows/desktop/ms734257(v=vs.85).aspx
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