"Rosen, Brian" <[EMAIL PROTECTED]> wrote:
B2BUAs have often caused much confusion because they can be used
in a variety of situations. One can make a B2BUA that sits in the
middle of a service and exerts control as you describe. I do hope
that no one would be so foolish as to actually do this, because it
breaks end to end security, increases the probability of failure,
and decreases the range of services that could be provided.
There are more reasonable ways to make sure theft of service is
not possible.[Rama] That is a given that B2BUA can be made to sit in the middle and exert control and there are folks who are currently doing it. I am not sure why is that going to break end-2-end security. Are you presuming that without B2BUA there would have been authentication schemes and B2BUA may not.
On the other hand, B2BUAs can be media relays. They don't have to be,
but they can be. With a B2BUA, one side of it is a UAS and the other
side is a UAC, so when you state that media goes between a UAS and
a UAC, a B2BUA could very well be in both media paths. However, a B2BUA
could choose to copy the SDP from one side to the other, and thus not be
in the media path. A session border controller is often implemented
as a media relay B2BUA.[Rama] I am wondering of instances of why would a B2BUA need to sit between UA's media path (or act as media relay's as you call them). I can think of multicast being initiated depending on service.
Brian
-----Original Message-----
From: Ramachandran Iyer [mailto:[EMAIL PROTECTED]
Sent: Tuesday, November 25, 2003 4:56 AM
To: KANUMURI Sreeram; [EMAIL PROTECTED]
Cc: Adam Roach; [EMAIL PROTECTED]
Subject: Re: [Sip-implementors] Question on B2BUA
B2BUA will act from from a signalling stand-point,where it isolates both the
end (or legs) making it 2 different calls (as opposed to a single call when
you would have a proxy in the middle).
The major signifcance of having a B2BUA is of control over both parties or
both sides of the communication, where is no chance of the B2BUA being
elimated from the session path. This helps in it being positioned for all
of application/services and becomes a central point for doing billing etc..
Having said that, to reply to your question: RTP will always be between the
UAC & UAS, there is no role (no need) for B2BUA to be anywhere there. The
SDP information is anyways propagated from one end to the other by B2BUA.
Hope this helps.
Rama
KANUMURI Sreeram <[EMAIL PROTECTED]>wrote:
Hi all,
In B2BUA will all the RTP packets also route through B2BUA?
if yes can you please give a pointer for this.(draft..)
if not what is the difference than between Proxy and B2BUA!!!
Thanking you in advance!!!
Regards,
Sreeram
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