Question about Limiting Internal DN Dialing

I have been looking at several options about restricting internal dialing for a site to only a specific DN prefix. Here is my dilemma.
All of the internal DN's are in the same Partition. So lets say I have 1xxxx-8xxxx DN's in this partition and I want to limit specific phones to only be able to dial 4xxxx DN's. Initially I was thinking about placing all of the 4xxxx DN's into their own Partition and only allowing this partition to the restricted phones CSS. However, for the rest of the DN's to contact 4xxxx, I would then have to add this Parition to the numberous CSS's already established.
I started looking at Route Filters (Office Codes) and applying it to a Route pattern that would only allow 4xxxx DN's. However, accomplishing what I am trying to with this option I cannot yet wrap my head around. Does anyone have any suggestions? I am labbing it up right now and still running into issues.
All of the internal DN's are in the same Partition. So lets say I have 1xxxx-8xxxx DN's in this partition and I want to limit specific phones to only be able to dial 4xxxx DN's. Initially I was thinking about placing all of the 4xxxx DN's into their own Partition and only allowing this partition to the restricted phones CSS. However, for the rest of the DN's to contact 4xxxx, I would then have to add this Parition to the numberous CSS's already established.
I started looking at Route Filters (Office Codes) and applying it to a Route pattern that would only allow 4xxxx DN's. However, accomplishing what I am trying to with this option I cannot yet wrap my head around. Does anyone have any suggestions? I am labbing it up right now and still running into issues.
Comments
CUCM SRND 9x/10, UCCX SRND 10x, QOS SRND, SIP Trunking Guide, anything contact center related
CUCM SRND 9x/10, UCCX SRND 10x, QOS SRND, SIP Trunking Guide, anything contact center related