[Serusers] SIP encrypted calls

[Nils Ohlmeier]

Hi Klaus,

On Monday 28 February 2005 11:31, Klaus Darilion wrote:
> Nils Ohlmeier wrote:
> > There are clients. See my previous mail. SRTP is completely transparent
> > for SIP proxies.
>
> How will the clients exchange the key for the RTP encryption? Will it be
> sent in the SDP? If yes, wouldn't I also need encrypted SIP to hide the
> RTP key?

Yes the keys will be exchanged within the SDP. So indeed you should crypt the 
SDP in signaling either by using TLS or S/MIME. Otherwise someone could read 
the keys from the signaling and decrypt the RTP streams.

Greetings
  Nils