We have cucm version 8 what is the reason for the option route partition under line. The reason I ask this if I have no css for line and device but I have assing a partition under router partition under line nothing happens cannot call no where until i assing a css under line or device. So what the point for route partition. Even if I assign the same partition under route partition to another dn partition I cannot dial that dn in the same partition. I feel the route partition is useless or is it?
Jaime is spot on (+5 J.). It would be a really good idea if you would take a couple of hours to go through the SRND. It is kinda heavy so you may need to iterate through it a couple of times. In regards to Route Partitions (Partitions) and Calling Search Spaces (CSS) try to think of a partition as a collection of patterns and a CSS as a collection of partitions.
The partition of "<none>" is special. It basically says that this pattern (whatever the pattern is: Directory Number, Translation, Route Pattern, etc.) is part of every CSS. Think of "<none>" as default for the time being.
The CSS of "<none>" is exactly what it says "none". As in there is no CSS. As in the only partition in the collection the "<none>" or default partition. This is why you can put a phone number on two phones, not assign a partition or CSS, and make calls. This is not a proper design, even if the calls work.
When you put your Directory Number (DN) in a partition (e.g. MyPhones_PT) you have removed the pattern from the <none> partition. Since the <none> CSS does not visibility of MyPhones_PT, you can't call the phone. This is operating as expected.
There are other rules around patterns/partitions/CSS relationships. No sense in digging into that here. However, this relationship is far from useless. It is core to the whole digit analysis process.
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