[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
What does this SAS log tell us?  In particular why is the uri from the Route: header interesting (won't it always be `cdiv.<domain>` or similar)?