Pradip,
What you describe is indeed an example of one kind of B2BUA. But not all
B2BUAs are of that sort.
A B2BUA is really nothing more than two UAs that are coupled in some
way. The manner of coupling is not defined. The only real requirement on
a B2BUA is that each of its UAs must follow all the rules that any UA
must follow.
*Some* things that a B2BUA might do:
- receive a request on one UA, send a corresponding request
from the other UA. (As you describe.) How the request that
is sent relates to the one received can vary - perhaps they
have the same media streams.
- send a request from one UA, then send a related request
from the other UA. This form is often used to do click-to-dial.
- receive requests at both UAs and respond in some way that
coordinates them. (A transcoder might work this way.)
- link for than two UAs. (A B2B2B2B...2B UA?) Act as some
combination of the above. A conference focus is an example of this.
Paul
Pradip Gajjar wrote:
Hi Kalan,
See the B2BUA means "Back to Back Use Agent". It will
receive the request from some SIP element at that time it will be
working as a UAS and then it will generate the same request and
forward it back to the SIP element from what it has received the
request at this time it will be working as a UAC. so you will be
having question then why this is request has come to the B2BUA. The
answer is like suppose there is one Application Server which will be
having the application details and the subscriber details who has
opted for this. so it will check whether the requested user has
subscribed for particular service or not. So each and every request
should come to Application Server which will process the request and
generate new request according to the received the request. So in
short it is sending back whatever it is receiving with some
modification in the SIP Message(some header field will be added in
message). So it is referred as a B2BUA. Hope this will make your doubt
clear.
On 8/7/05, kalan kalan <[EMAIL PROTECTED]> wrote:
Hi
I am facing several times B2BUA in RFC-3261.
Please clear concept of B2BUA.
Tkanks
Kalan
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