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I recently attended a talk about GNU Telephony. I was informed that Twinkle supports ZRTP for encrypted SIP calls.

I went into Edit > User Profile > Security and made sure that ZRTP was enables and that all boxes were checked. I asked a friend to do the same and then we called each other. There is no immediate indication that I can see that the call is secure.

How can I tell if ZRTP is enabled in a Twinkle SIP call?

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closed as too localized by Seth, vasa1, Eric Carvalho, Eliah Kagan, Thomas W. Mar 8 '13 at 5:55

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

    
Are you still looking for an answer on this? –  Seth Mar 5 '13 at 0:05