Re: [AVT] Media over DTLS

[Mark Baugher <mbaugher at cisco.com>]

On Mar 2, 2006, at 6:51 PM, Mark Baugher wrote:

> Eric,
>
> On Mar 2, 2006, at 6:05 PM, Eric Rescorla wrote:
>
> > Mark Baugher <mbaugher at cisco.com> wrote:
> > > On Mar 2, 2006, at 3:59 PM, Eric Rescorla wrote:
> > > > Why is this interesting? SIP does not have a scheme for key
> > > > negotiation
> > > > of media encryption that works with early media and forking.
> > >
> > > This is not true.  RFC 3830 does.
> >
> > Hmm... That wasn't quite what I took away from 3830.
> >
> > Can you walk me through the SIP call flows for using 3830 with
> > forking and early media?
>
> It's a short walk as I expect you know: 3830 can work with a single  
> message (for all of its modes except for the Diffie-Hellman mode)  
> or a round-trip exchange.  In the modes other than DH, the  
> initiator sends the policy and a media key embedded in the SDP of  
> the Invite.  At this point, the responder has everything it needs  
> to send media to the initiator.  The same is true in the case of  
> forking.

Sorry, what I said is true for forking OR early media but I don't  
think 3830 supports both forking and early media.

Mark
> The simple fact that 3830 works with a single message means that no  
> response is needed to establish the SRTP crypto context.
>
> Mark
> > Thanks,
> > -Ekr
>
> _______________________________________________
> Audio/Video Transport Working Group
> avt at ietf.org
> https://www1.ietf.org/mailman/listinfo/avt

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