If you want to document the changes needed to upgrade the config defined in the howto, please, be my guest and write a post in your blog, or a whole howto, if you prefer, so other people can benefit of those hours you spent searching for the solution of your problem.
Sorry, but, I still don't see how this is related to kamailio default config or the lack of upgrade documentation.
Again, there's a mailing list sr-users@lists.kamailio.org where you can ask for help. This is for actual bugs in the code.