Re: francois' comments and why RFC4474 not used in the field

Hans Erik,
 
I think the issue is to verify that the media is to/from the same user
as the signalling. I agree it would be complex if we were dealing with
different users.
 
John


________________________________

	From: [email protected] [mailto:[email protected]] On
Behalf Of Hans Erik van Elburg
	Sent: 31 March 2009 08:49
	To: Jonathan Rosenberg
	Cc: SIP List; Uzelac, Adam; Dean Willis
	Subject: Re: [Sip] francois' comments and why RFC4474 not used
in the field
	
	
	This litmus test seems to mixup presentation with Identity.
	
	All identity presentation services I know of are based on
signaled identity. Of course a more advanced identity presentation
service can be devised that also incorporates media identity. But this
can become quite complicated, imagine 1 session containing multiple
media streams coming from different entities, what do I present?  Or
will this not be allowed anymore?
	
	The first thing I would be interested in is who is trying to
setup a session with me, and if I trust that someone. If I have more
stringent requirements also on the media integrity then I need something
additional. 
	
	/Hans Erik van Elburg
	
	
	
	On Tue, Mar 31, 2009 at 4:12 AM, Jonathan Rosenberg
<[email protected]> wrote:
	

		inline: 


		Jiri Kuthan wrote:
		
		
		

				 From an end user perspective, I would
assert that the most important thing is probably the media. If the
callerID says, "this is bob", what is important to the user, is that
when I pick up the phone and start talking, it will be Bob who hears me,
and Bob that I hear.
				
				Consider this litmus test:
				
				If the signaling actually came from Mary
(perhaps as a third party), but the media goes/comes to/from Bob, who
should appear on the caller ID? I say - Bob.
				


			There is a timing aspect in favor of placing
identity in signaling --
			I would like to know whose call is ringing
before I answer (if I do).
			


		You can still have that. Just don't ring the phone until
early media has been exchanged and verified. Indeed if you were doing an
ICE-style thing per Dan's draft, you'd get that for free. 


		-Jonathan R.
		
		
		
		-- 
		Jonathan D. Rosenberg, Ph.D.                   111 Wood
Avenue South
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