Hi,
The device pool related information for Device Mobility is explained in the features and services guide
Configuring Device Pools for Device Mobility
The roaming sensitive settings in the Device Pool Configuration window override the device-level settings when the device roams within or outside a of device mobility group. The settings, which include Date/time Group, Region, Media Resource Group List, Location, Network Locale, SRST Reference, Physical Location, Device Mobility Group, and so on, provide call admission control and voice codec selection. Additionally, these settings update the media resource group list (MRGL), so appropriate remote media resources get used for music on hold, conferencing, transcoding, and so on. The roaming sensitive settings also update the Survivable Remote Site Telephony (SRST) gateway. Mobile users register to a different SRST gateway while roaming. This registration may affect the dialing behavior when the roaming phones are in SRST mode.
The device mobility related parameters in the Device Pool Configuration window override the device-level settings only when the device is roaming within a device mobility group. The device mobility related settings affect the dial plan because the calling search space dictates the patterns that can be dialed or the devices that can be reached.
Refer to Device Pool Configuration in the Cisco Unified Communications Manager Administration Guide to configure device pool parameters.
Viewing Roaming Device Pool Parameters
When the phone has device mobility mode enabled, you can view the roaming device pool settings by clicking View Current Device Mobility Settings next to the Device Mobility Mode field in the Phone Configuration window. If the device is not roaming, the home location settings display.
If there is anything additional you need to know please let me know.
HTH
Manish
