----- Original Message -----
Sent: Tuesday, December 02, 2008 11:51
PM
Subject: RE: Initial WG review:
draft-johnston-sipping-cc-uui-06
Alan and Joanne,
Looking at the redirection example, I could
imagine a similar case but
using proxying (retargeting or rerouting) rather
than redirection. In
this case the proxy would insert the UUI in the
forwarded request. Is
see no requirement for this in section
3.
However, PSTN/ISDN does not support capabilities equivalent to
insertion
by a proxying or redirecting entity.
[Joanne] PSTN/ISDN most certainly allows for transition of UUI with
redirect - and that is
a very important point... see more information below...
Yet in section 1 it states:
"This document looks only at
the
requirements and mechanisms for replicating the existing,
widely used
and deployed ISDN UUI service."
Therefore we should either:
- remove the redirection case, on the
grounds that it doesn't replicate
existing ISDN UUI operation; or
[Joanne] Redirection most certainly does replicate current ISDN behavior
- there are
ISDN standards supported by PSTNs where they actually do a redirect as
requested
by a PBX - ANSI Explicit Network Call Transer and ETSI Network Call
Deflection
are two popular specs supported and used with PSTNs - both of
them allow for
transmitting the UU IE as part of that PSTN redirect service for
private networks. Hence, the SP redirect case
here is certainly 100% valid in SIP. If we do something to disallow
it in SIP (or just ignore it) then we are going
to cause interop problems and certainly not have parity with ISDN for
full UUI transmission support
for redirects... and the industry needs that...
- clarify the statement in section 1 so as not to preclude
the
redirection case.
Furthermore, if we adopt the second of these
approaches we might wish to
consider adding a requirement for insertion by
a proxy. Fortunately the
chosen mechanism would seem to permit
this.
I have no strong feelings which approach we should take. I just
wish to
see consistency.
John
> -----Original
Message-----
> From:
sipping-bounces@xxxxxxxx >
[mailto:sipping-bounces@xxxxxxxx] On Behalf Of Mary Barnes
> Sent: 02
December 2008 00:49
> To:
sipping@xxxxxxxx> Cc: Gonzalo
Camarillo
> Subject: Initial WG review:
draft-johnston-sipping-cc-uui-06
>
> Hi folks,
>
>
This email is intended to announce an initial WG review for
> the
following document:
>
http://www.ietf.org/internet-drafts/draft-johnston-sipping-cc-
>
uui-06.txt
> <
http://www.ietf.org/internet-drafts/draft-johnston-sipping-cc>
-uui-06.txt>
>
> There was strong consensus to complete
the problem statement
> and requirements in the SIPPING WG session
(i.e., WGLC) and
> then propose that the solution be worked in SIP WG -
with the
> obvious understanding that SIP WG must go through the
process
> of taking on a new work item. And, of course, the
chairs
> will work with the AD to get the appropriate milestones added
> to SIPPING WG charter.
>
> In order to progress this
document in the SIPPING WG, we
> would like at least 3 (ideally 4)
dedicated reviewers. So,
> please let us know ASAP if you would be
willing to serve as a
> reviewer. If we don't get volunteers, I
will pick on people,
> but it would be great to get some new reviewers
into the pool.
>
> In terms of feedback, as well as
technical comments, we would
> like to hear views on whether this doc
is ready for WGLC
> (note that this document has been in the WG as an
individual
> draft for over two years).
>
> Please send
any and all comments on or before Dec. 22nd, 2008
> (3 weeks time).
>
> Regards,
> Mary.
> SIPPING WG co-chair
>
>
