I was searching something about integration of Arduino with Asterisk PBX and I found this interesting article:
Using Asterisk to Control your Arduino
This article is how to control Arduino over Ethernet using Asterisk PBX, making a call and controlling over it comm channel.
So then, you can make a IVR and control your Arduino calling it wherever you are.
Source:
http://www.nerdybynature.com/index.php/2009/03/using-asterisk-to-controll-your-arduino
