At the suggestion of Paul Kyzivat and Dale Worley, I compared

draft-ietf-sipping-race-examples-06.txt

to the basic Spin model of INVITE dialogs at

http://www.research.att.com/~pamela/sip.html.

Of the 13 race conditions in the sipping draft, 6 of them are out of the scope of the Spin model. Most commonly, this is because they include retransmission of a lost message. There are no transmission failures in the Spin model.

Of the remaining 7, all of them are in the Spin model, handled the same way.

In addition, the Spin model shows 42 additional race conditions. This count is subject to a lot of interpretation, so I estimate a possible error of about 20%.

Pamela Zave
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