Subject: RE: [Sipping] draft-ietf-sipping-isup

From: "Peterson, Jon" <[email-masked]>
Date: Mon, 8 Jul 2002 13:53:32 -0500

To expand a bit on Adam's reply:

In a more literal sense, it was the elimination of the 100rel document. As
you may recall, for a time 100rel was wrapped (a little awkwardly, since it
was still cast as an extension) into the core SIP specification - this was
some time around rfc2543bis05, I believe. The reference to 100rel as a
separate document disappeared from sipping-isup then. When 100rel was pulled
back out of bis, there was still some confusion about its status, which
motivated the removal of PRACKs and so on from the SIP-ISUP draft. 

We reasoned at the time SIP-ISUP really had no dependency on any specific
means of making reply transmissions reliable, merely that they be so.
Omission of PRACKs made call flows somewhat smoother, and it didn't seem
that PRACKs had any mapping to ISUP or any especial bearing on the mapping
to ISUP (at least, no more bearing than reliable response delivery has for
any other SIP mechanism, not all of which provide PRACKful examples).

Do you feel differently? Is there some ambiguity in the mapping that arises
from the absence of the use of the 100rel mechanism? 

Jon Peterson
NeuStar, Inc.

> -----Original Message-----
> From: Alexeitsev, D [mailto:[email-masked]]
> Sent: Friday, July 05, 2002 1:09 AM
> To: [email-masked]
> Subject: [Sipping] draft-ietf-sipping-isup
> 
> 
> Hello All
> 
> Sorry if it was already discussed, but I couldn't fine the 
> SIPPING archives search page. 
> 
> What was the rationale to remove the 100rel from the 
> draft-ietf-sipping-isup?
> 
> Greeting,
> Denis Alexeitsev
> 
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