Re: [Sip] B2BUA & Max-Forwards

["Pete Cordell" <pete@tech-know-ware.com>]

Jonathan,

I have not said anything about generic B2BUAs here.  Each B2BUA
implementation will need to have its own record (and server) of what it is
transparent to or not.  It would not be a generic list.

Perhaps it is reasonable to remove the B2BUA definition, since there is no
definition of a gateway and they are similar beasts.  Just as long as such
an action does not imply that SIP is not suitable for a certain class of
problem.

Pete.

----- Original Message -----
From: "Jonathan Rosenberg" <jdrosen@dynamicsoft.com>
To: "Pete Cordell" <pete@tech-know-ware.com>
Cc: "Adam Roach" <adam@dynamicsoft.com>; "'Phil Reynolds'"
<preynolds@ridgewaysystems.com>; <sip@ietf.org>
Sent: 05 December 2002 16:16
Subject: Re: [Sip] B2BUA & Max-Forwards


>
>
> Pete Cordell wrote:
> > This is correct.  A B2BUA can't blindly forward a request containing a
> > Require header.
> >
> > The saving grace for a B2BUA is that it does not need to understand the
> > extension in detail.  It just needs to know whether it can forward a
request
> > that contains a given Require header.  This can be easily provisioned
using
> > some sort of ASCII configuration file, and doesn't require any new code
etc.
> > A B2BUA could even routinely download the list of acceptable Require
headers
> > from some sort of server.  (A smart B2BUA could even post back a set of
> > unknown Require headers that it has seen recently.)
>
> This is a vast over-simplification.
>
> As people have been saying over and over in this thread, there is no
> such thing as a "generic b2bua" as you seem to be implying. What is
> right in a b2bua depends entirely on what its doing. To be honest, I
> can't think of any b2bua for which the processing you describe above is
> sensible. As I mentioned in a previous note, a b2bua deviates from a
> proxy by doing some featurs that are normally associated with a UA. That
> b2bua will need to process extensions (i.e., implement them) that are
> associated with that feature.
>
> I am at the point where I agree with the sentiment raised by others,
> that we should remove the term b2bua entirely from the specification. It
> has caused more confusion than anything else.
>
> -Jonathan R.
> --
> Jonathan D. Rosenberg, Ph.D.                72 Eagle Rock Ave.
> Chief Scientist                             First Floor
> dynamicsoft                                 East Hanover, NJ 07936
> jdrosen@dynamicsoft.com                     FAX:   (973) 952-5050
> http://www.jdrosen.net                      PHONE: (973) 952-5000
> http://www.dynamicsoft.com
>


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