21. Acknowledgements

The authors would like to thank Cedric Aoun, Pete Cordell, Cullen Jennings, Bob Penfield, Xavier Marjou, Magnus Westerlund, Miguel Garcia, Bruce Lowekamp, and Chris Sullivan for their comments, and Baruch Sterman and Alan Hawrylyshen for their initial implementation. Thanks for the IESG and IAB input on this work from Leslie Daigle, Allison Mankin, Eric Rescorla, and Henning Schulzrinne.