On Tuesday 26 March 2013 16:13:43 joerg Reisenweber wrote:
> Encrypted GSM calls are basically not feasible
> to transfer encrypted voice you need a data link between the both ME, GSM
> creates GSM-codec voice path, not a data path. Means your data gets mangled
> by carrier's audio processing. You *can* *not* send data at a reasonable
> speed over a GSM voice call link.

IIRC it's been done with GSM data calls but I don't know if the code was ever 
released. At 9600bps it's not just SIP/ZRTP over PPP though!

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