Device Mobility

When phones move between different CUCM sites, inaccurate phone settings may occur.
The phone configuration parameters that can be dynamically applied to the device configuration are grouped in two categories:
- Roaming-Sensitive Settings
 Date/Time Group (dp)
 Region (dp)
 Location (dp)
 Connection Monitor Duration (dp)
 Network Locale (dp, phone)
 SRST Reference (dp, phone)
 Media Resource Group List (dp, phone)
 Physical Location (dp)
 Device Mobility Group (dp)
- Device Mobility-Related Settings (impact on call routing)
 Device Mobility Calling Search Space (dp, phone)
 AAR Calling Search Space (dp, phone) (Calling Search Space only in the Phone Configuration not Line!)
 AAR Group (dp, phone)

Overlapping parameters configured at the phone have higher priority than settings at the home device pool and lower priority than settings at the roaming device pool.

Algorithm:
The current device pool is chosen as follows:
 - If the DMI is associated with the phone's home device pool, the phone is considered to be in its home location. Therefore, Device Mobility does not reconfigure the phone.
 - If the DMI is associated with one or more device pools other than the phone's home device pool, one of the associated device pools is chosen based on a round-robin load-sharing algorithm.
If the current device pool is different from the home device pool, the following checks are performed:
 - If the physical locations are not different, the phone's configuration is not modified.
 - If the physical locations are different, the roaming-sensitive parameters of the current roaming device pool are applied.
 - If the Device Mobility Groups are the same, in addition to different physical locations, the Device Mobility-related settings are also applied, along with the roaming-sensitive parameters.
When a user roams with a device from Germany to the U.S., all the roaming-sensitive settings are applied, but the Device Mobility-related settings are not applied. The phone now uses the PSTN gateway and dial rules of its home location even though the user moved to another site. The user does not have to adapt to the dial rules of the local site to which the phone was moved.


Configuration:
1. Configure physical locations.
2. Configure Device Mobility Groups.
3. Configure device pools.
4. Configure DMIs (that is, IP subnets).
5. Set the Device Mobility mode using the following:
 - A Cisco CallManager service parameter to set the default for all phones
 - The Phone Configuration window for an individual configuration for each phone.