Just know that even though the front end is Open source (and looking pretty awesome might I add), the backend telco stuff is tied to twilio which means you'll be paying their usage fees.
Unlike other open source solutions such as Asterisk or Freeswitch (which both suck in their own ways) where you can buy your own VoIP trunking/termination service from any number of companies and negotiate your own pricing.
Tropo has Twilio like functionality and some out of the box features for pbx-ing, but they allow you to either run hosted, or if I'm not mistaken, purchase their own backend telco engine and run in your own network with your own trunking provider.
Unlike other open source solutions such as Asterisk or Freeswitch (which both suck in their own ways) where you can buy your own VoIP trunking/termination service from any number of companies and negotiate your own pricing.
Tropo has Twilio like functionality and some out of the box features for pbx-ing, but they allow you to either run hosted, or if I'm not mistaken, purchase their own backend telco engine and run in your own network with your own trunking provider.