July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
84 00 .. Overview of Communications Systems (Telephone)
WARNING: This page is about a different car, the 2008 BMW 760Li, 2007 BMW 760Li, and 2006 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Overview Of Communications System Components