VOIP: RTP vs SRTP

[defragz () hotmail com]

Hello list,

Planning some internal presentations on VoIP, I was wondering if SRTP (Secure Real Time Protocol) is now really in use, 
as a secure replacement of RTP. 

More generally, from your experience, and from what you have seen in "real life", do you thing that VoIP security is 
getting better? Do people use crypto to protect both data and signalling?
I will love to hear your feedbacks...
-Franck


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