most of the parameters - including Calling Search Spaces - may be configured at multiple places.
There is one important thing to remember, though: if a parameter is not set for a certain entity, it might be still applied - using the parameter value at a lower level.
So if CSS is not set at the Line level, the CSS set at the Device level is applied (in other words, if no CSS is set on the Directory Number page, then the CSS set at the Phone Device level is applied).
That's the easy part.
Now, what happens if the CSS is set at both the Directory Number and the Device level: the lists of partitions are concatenated. First comes the partitions from the DN, then the partitions from the Device.
So if there's a CSS called "LineCSS" containing partitions A, B, C and a CSS called "DeviceCSS" with partitions X, Y, Z, then anyone calling from that DN would have access to partitions (and in this order): A, B, C, X, Y, Z.
Unless it's a CTI Port, because then the order is different, first comes Device, then the line, so it would be X, Y, Z, A, B, C.
A bit confusing, isn't it?
Now, back to the list you posted: not everything named CSS is related to calling restrictoins. Restrictions, yes.
Take the SUBSCRIBE CSS - it's related to who can see whose presence information.
I would recommend you to take a look at the "Help for this page" for each page - they might contain useful information for a beginner.
if the phone does not have a CSS, well, then... it does. No kidding. It has an imaginary CSS that contains only the "None" Partition (or rather, Partition) meaning that the phone without any CSS will still be able to reach basically anything that resides in the partition. You might have noticed that Directory Numbers do not require a Partition.
The Calling Search Space for Auto-registration is applied to phones created with the auto-registration function of the CUCM. Basically, you plug in the phone, and CUCM creates and pushes its configuration, including the CSS set at the device pool level.
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
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