Thanks for the hype, notification and questions.
- the Linphone app currently diesn't support encryption. It's planned for next releases. Supposedly is possible with the code but all the help is welcomed.
- About privacy, here you have the legal aspects of Linphone service. Notice that when stted «contact list on your phone» and similars, they are talking about iOS and Android Linphone apps.
Linphone for UT uses the command line Linphone, called linphonec and the daemon linphonecsh and you can see here the modification Brian did to it and the qml code used in the app.
- Here you can check how SIP should work as a protocol.
- And to change the email parameter for a Linphone account, you have to do it (for now) at their website or creating a «new account» in the app and checking the bottom section (witch is actually the same website).