Hello,
I want to use this shield https://www.cooking-hacks.com/3g-gprs-shield-for-arduino-3g-gps-audio-video-kit to make phone calls. The arduino is going to be monitoring some inputs and if there is a change of state make a call with a pre-recorded voice message. If I don't answer it will call the next number and so on. My problem is that once I get that call how do I acknowledge that call so arduino ends it's calling process until the next state change?
Thanks,
Arie