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Yep! Twilio is providing the SIP Trunking. We are running our own SIP servers though.

Neat, why do you run your own SIP servers as Twillio can do that for you? Better control of the codec?

Lots of custom logic

* Limit user to 15m a month * Greetings unique to user state

It also needs access to Model/DB etc… which is all not exposable to internet