I did a version of this a couple years back: https://www.twilio.com/blog/2013/03/building-beyond-google-voice-with-twilio.html https://www.twilio.com/blog/2013/

I did a version of this a couple years back: https://www.twilio.com/blog/2013/03/building-beyond-google-voice-with-twilio.html https://www.twilio.com/blog/2013/03/building-beyond-google-v... It's rough but worked reliably.