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Being open-source is a very important point.

But any communication system that is built for the future must at least be (public-key) encrypted.

Then you, make it 100% decentralized and you're ready for our time where unlimited mass surveillance seems acceptable for "democratic" governments.

Plivo has an open source framework too. Currently this App is built on the cloud, but feel free to port it to open source version!

http://plivo.com/open-source/

I agree. I thought it was completely open-source. What's the use of open sourcing just a part of the code and forcing users to use a Plivo account to use the service (even if you self host it).