What is CoA (Radius Incoming), and how is it configured?

I don’t suppose Radius Accounting Port is the same thing as CoA, is it?

On a NAS, under Radius → New Radius Server, you can set 2 things:

  1. Authentication Port
  2. Accounting Port

Is it possible that the “Radius Incoming” port is setup on the server, and the Accounting Port is setup on the client to tell it which port on the server to connect to?

It’s either that, or the NAS gets configured using Winbox (Radius → Incoming → Port) and the User Manager gets configured through the User Manager web interface (Routers → Your NAS → Radius Incoming → CoA Port).

Or am I totally off?