Hi, I went through your attached document and I would like to handle your project for you. Do you have a previously working implementation of this? I ask this because on following the twilio link, I realized that twiliMais
I have read your job in detail and I am very comfortable to use PHP and Twilio on this job.
My clients are happy to pay me upto $60/hr and I have written this to prove my real experience.
You can check mMais