1. UPDATE Open Issues Jonathan Rosenberg dynamicsoft

2. Glare with PRACK UPDATE only specifies glare resolution with UPDATE Can also glare with PRACK Rejecting PRACK is bad Solutions: –(1) UPDATE wins [NO] –(2) Extend mechanism to PRACK [Can reject PRACK] –(3) Avoidance: Cant send UPDATE if you have sent an answer in 18x for which you have not gotten PRACK Proposal: (3) INV O1 183 A1 PRACK O2 UPDATE O3

3. Other Issues Include 493 Undecipherable? –May require user intervention to fix –Proposal: include it, add text saying it retries if it would otherwise retry with that response Generate 155 instead of 4xx MAY or SHOULD –SHOULD gives better services behavior in UPDATE-ignorant proxies