On Tue, 26 Mar 2013 15:58:10 +0100
Radek Polak <pson...@seznam.cz> wrote:

> I think there might be interest in encrypted GSM calls - those
> customers would be not worried by big price. It's just matter of
> implementing SW for it.
There are several solutions for that but using plain GSM won't work
because of the TRAU(Transcoder and Rate Adaptation Unit) in the GSM
network.
Using data calls directly would be too expensive...

So the best solution is to use encrypted SIP over the internet(like
trough a 3G connection) possibly over a VPN(because some providers
prevent SIP to go trough their networks).

Denis.

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