On the contrary, I don't want phones with specific device pool to roam between buildings.
Let's say, building 1 has phones configured with device pool DP1 and building 2 has phones configured with device pool DP2. Phones with device pool DP1 should not work in building 2 and vice versa. Both buildings have their own SRST gateways.
If its not possible with device pool than in what other way is this possible?
Build "Physical Location" for each location, assuming you are not currently using Device Mobility, if you are no need to do this
Build device mobility group
Build New CSS that has no parition listed in it
Build Device Pools, use the new CSS as Roaming CSS
Build device Mobility info group for each subnet at the location and assign the DP to them
Assign "Physical Location" to existing DPs used by the phones.
This way when phones register at a different "Physical Location" with an IP address defined in one of the device mobility info groups they will use this roaming device pool and roaming CSS that cannot dial anything, or whatever you defined in it.
For more details on how device mobility works check out SRND and CUCM Feature and System Guides.
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