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by n8fr8 5183 days ago
RedPhone had some nice optimizations like tying into your existing public phone number (perhaps a privacy issue depending upon your view), and using SMS or Google's Push service to ensure your device is not sleeping when you get a call. OSTN/OStel has no custom modifications, but alternatively then is pure open-standards based.

Voice quality wise they are about the same... the goal is for you to be able to run your own server as well. There is already some info available today on how to do this: http://freeborn.devio.us/doku.php?id=freeswitchfreebsd