I don't beleive you are wrong...
Specifically the Ring Strategies availible from Ring Groups or Follow Me Settings, and how the system finds the next phone to ring.
Hover your mouse over the context pop-up for "Ring Strategy" and you will find out what they all mean. There is Hunt, and Memory-Hunt available.
There are also -PRIM settings, that will stop the hunt if the primary number in the stratagy is occupied.