Hello Hans,
I apologize for the delay in responding, but I have been busily researching this and trying to track down the latest and greatest information for you.
Mixed news, I'm afraid.
It looks like the ICWS documentation "jumped the gun" a bit. From what I have been able to find out, the ININ.IceLib.Configuration.ManagedPhoneConfigurationConfiguration namespace has not yet been made public (which is why it isn't in the documentation.) The developers are still finishing off some of the internals, so it will hopefully make an appearance at some point, however there is no projected date or release number for it at the current time.
In the meantime, what is it that you are trying to achieve? We may be able to offer alternative solutions.
Finally, may I suggest you flag this up on the suggestions site? The link is under "Helpful Links" on the main community home page. I'm sure if a need (from our customer base) is identified, then the relative importance of this particular item may well get adjusted.