Autodialing program triggered by a GPS geofence - Any ideas?

I'm trying to tie in a GPS trigger from a geofence to an autodialing program with no interaction required from the user. The call would be routed to an IVR program and provide the needed prompts that are a constant and don't change. Any ideas would be greatly appreciated. GPS platform has the ability to send SMS and email upon geofence activation as a potential triggering event. I'm a novice but very eager to learn...Thanks in advance for you consideration!