Hi Karthik,

Functionality of B2BUA 

1. Act as inter-working functionality from SIP to H.323.  
2. Supports codec translations from two different call legs 
   I.e. A -> B2BUA -> B
3. By Call Management B2BUA can generate Call Detail records 
   for billing purposes.

Thanks,
Prateep.K

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
karthik karthik
Sent: Tuesday, September 23, 2008 2:50 PM
To: sip-implementors@lists.cs.columbia.edu
Subject: [Sip-implementors] why do we need b2bua?

Hello,
Here is a question which I have for long time.
What is the prupose of having B2BUA?
I know that the B2BUA changes from tag,
callid and maintains a seperate dialog when to tag is received.

But why it does change in these headers?
Some say it is for security reasons?
If yes how is it used for security. We also have NAT for security.

Some say it is for manipulation of supplementary services. If yes,
cant a statefull proxy handle the services
without changing call-id, from tag and to tag?

Thanks Karthik Prabhu
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