RE: [MMUSIC] RE: I-D ACTION:draft-kaplan-mmusic-best-effort-srtp-01.txt

And another for srtp-dtls and another for zrtp?

Maybe there is a more efficient way to combine these.  Perhaps only
including a=srtp for those key exchange mechanisms which can allow
decrypting SRTP media that arrives prior to the SDP answer?  Or perhaps
specifying the payload types in such a way that they're assigned to each of
the a= key management mechanisms understood by the answerer.  As a possible
strawman for this last idea:

  m=blahblah
  a=key-mgmt blahblah
  a=crypto blahblah
  a=fingerprint blahblah (used by srtp-dtls)
  a=zrtp
  a=srtp key-mgmt 40 crypto 41 fingerprint 42 zrtp 43

-d

> -----Original Message-----
> From: Elwell, John [mailto:john.elwell@siemens.com] 
> Sent: Thursday, October 26, 2006 11:07 PM
> To: Francois Audet; Hadriel Kaplan; mmusic@ietf.org
> Subject: RE: [MMUSIC] RE: I-D 
> ACTION:draft-kaplan-mmusic-best-effort-srtp-01.txt
> 
> Francois,
> 
> Yes, that would work.
> 
> John 
> 
> > -----Original Message-----
> > From: Francois Audet [mailto:audet@nortel.com] 
> > Sent: 27 October 2006 01:22
> > To: Elwell, John; Hadriel Kaplan; mmusic@ietf.org
> > Subject: RE: [MMUSIC] RE: I-D 
> > ACTION:draft-kaplan-mmusic-best-effort-srtp-01.txt
> > 
> > Maybe we could use one a=srtp line for crypto, and another one for
> > kmgmt?
> > 
> > (i.e., have a different PT for each?) 
> > 
> > > -----Original Message-----
> > > From: Elwell, John [mailto:john.elwell@siemens.com] 
> > > Sent: Thursday, October 26, 2006 5:56 AM
> > > To: Hadriel Kaplan; Audet, Francois (SC100:3055); mmusic@ietf.org
> > > Subject: [MMUSIC] RE: I-D 
> > > ACTION:draft-kaplan-mmusic-best-effort-srtp-01.txt
> > > 
> > > Hadriel, Francois,
> > > 
> > > Thanks for working on this update. Just one point. If both 
> > > SDescriptions and MIKEY are offered (inclusion of a=crypto 
> > > and a=key-mgmt lines) and a different payload type is also 
> > > indicated for SRTP, this payload type would apply whether the 
> > > SDescription-derived key or the MIKEY-derived key is used.
> > > So until the SDP answer arrives, it would still not be 
> > > possible to render SRTP. Of course, in the case of 
> > > SDescriptions it is not possible anyway, but in the case of 
> > > certain MIKEY options it ought to be possible. Unfortunately 
> > > to resolve this we would need somewhat more complex syntax in 
> > > the a=srtp line.
> > > 
> > > John
> > > 
> > > > -----Original Message-----
> > > > From: Internet-Drafts@ietf.org [mailto:Internet-Drafts@ietf.org]
> > > > Sent: 25 October 2006 20:50
> > > > To: i-d-announce@ietf.org
> > > > Subject: I-D ACTION:draft-kaplan-mmusic-best-effort-srtp-01.txt
> > > > 
> > > > A New Internet-Draft is available from the on-line 
> > Internet-Drafts 
> > > > directories.
> > > > 
> > > > 
> > > > 	Title		: Session Description Protocol (SDP) 
> > > > Offer/Answer Negotiation For Best-Effort Secure Real-Time 
> > Transport 
> > > > Protocol
> > > > 	Author(s)	: F. Audet, H. Kaplan
> > > > 	Filename	: 
> draft-kaplan-mmusic-best-effort-srtp-01.txt
> > > > 	Pages		: 17
> > > > 	Date		: 2006-10-25
> > > > 	
> > > > This document defines the requirements and a proposed 
> > solution for 
> > > >    an SDP Offer/Answer exchange model for negotiating 
> > > best-effort SRTP
> > > >    keys, i.e., in a backward-compatible manner with 
> > > non-SRTP devices.
> > > >    The proposed solution is a trivial interpretation of the 
> > > usage of 
> > > >    the profile and the usage of SDP indication of [sdesc] 
> > > and [kmgmt].
> > > > 
> > > > A URL for this Internet-Draft is:
> > > > http://www.ietf.org/internet-drafts/draft-kaplan-mmusic-best-e
> > > > ffort-srtp-01.txt
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