There are many SIP Trunk providers that 'work' with OCS 207 R2 - some that are on the Microsoft OIP and some that are not. The goal of this blog will be to objectively compare the various providers from basic functionality to customer service...
A current issue with a Microsoft patch has been discovered (and currently blogged about in numerous locations). In short, if security update KB974571 is installed on your OCS/LCS servers to believe they are expired evals. Removing the hotfix resolves...