title: Hardware to create a IVR and SMS system
body: <p>I developed a IVR and sms system using twilio.com. I have used it's api to develop the system. But now I want to have my own setup which does the same features. I did some home work and read things about VOIP and SIP. All those talks about internet calls. But this is something that I need to call a cell phone or land line and expect calls from those phones. Is this possible without using any hardware and also not relying on services like Twilio.</p>