twilio is the entire package. If you use OpenVBX along with twilio you can replace your phone system. And if you still want to hold onto your phone system you c

twilio is the entire package. If you use OpenVBX along with twilio you can replace your phone system. And if you still want to hold onto your phone system you can use SIP out with twilio. Pretty soon they'll have SIP in as well. Overall, twilio is more robust, more reliable, priced better, and more flexible. No one in the market even comes close. I've been doing telecom for over a decade and there's nothing better than twilio for telecommunications.