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[liberationtech] Ostel: encrypted phone calls

Pavol Luptak wilder at
Wed Jun 5 11:19:48 PDT 2013

On Wed, Jun 05, 2013 at 07:12:22PM +0200, KheOps wrote:
> Hi all,
> Just came accross that:
> Open source software for encrypted calls, with a client that apparently
> runs on a lot of platforms.
> Anyone ever used/reviewed it already?

I used it with my Android SIP clients (CSIPSimple, Acrobits Softphone),
It should be completely based on opensource FreeSWITCH with enabled ZRTP support. 

CSIPSimple + FreeSWITCH is probably the best opensource ZRTP solution for
end-to-end encrypted calls.

BTW, what do you think about security of Threema 
Now they have out Android version and it is very user-friendly, unfortunately 
it's still closed/proprietary software, so I am not sure about security.

[Pavol Luptak, Nethemba s.r.o.] [] [tel: +421905400542]

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