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Summary of Changes Refined state machines Removed Trying & Proceeding substates Better alignment with 3261, rather than 4235 Added missing transitions identified by reviewers Improved labeling Clarifed timer transitions More discussion of use of 491 response Recommend it for other forms of glare, not just reINVITE vs reINVITE More discussion of BYE in early dialog Added optional avoidance strategy for race on early BYE Added another example of multiple dialogs being established by single INVITE Reduced message detail where not needed Improved wording Added missing mandatory sections |