[Reviewer: Andy] Call Diversion AS

Alex,

Please can you review the call diversion AS code?  I've manually live-tested but not yet UT-ed (except for simservs, which was trivial) or regressibly-live-tested.

Matt
As discussed, it doesn't add anything at this stage, and just requires a load more work now.  (We can move the code just as easily then as we could now.)