Re: B2BUA Documents

Hi Bill,

In my opinion, the most conspicuous differences are
- Signaling messages are re-originated by a B2BUA, whereas
they are
usually modified and forwarded by a proxy. 
- Most B2BUAs can handle media

Because of these, B2BUAs are better equipped to handle
certain features
compared to proxies. Typical examples could be:
- Media Transcoding
- Transcrypting (decrypt - re-encrypt) of media/signaling
- Topology hiding
- protocol translation (SIP-H.323 etc)...
As Gary mentioned, Google is the best place to dig out more.


For B2BUAs which act as Session Border Controllers, you can
find some
good information in
http://www.ietf.org/internet-drafts/draft
-ietf-sipping-sbc-funcs-00.txt

Regards,

Nishant

-----Original Message-----
From: sip-implementors-bouncescs.columbia.edu
[mailto:sip-implementors-bouncescs.columbia.edu] On Behalf
Of Bill Lo
Sent: Thursday, January 25, 2007 1:45 AM
To: SIP Implementors
Subject: [Sip-implementors] B2BUA Documents

Hi Folks:

Can someone direct me to a document that clearly outlines
the
differences between a SIP Proxy and a B2BUA.  While RFC 3261
outlines a
proxy, the B2BUA is still a bit vague.  How and why would I
use a B2BUA?


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