Under Roaming Sensitive Settings, assign the parameters that you set up in the previous device mobility tasks:
>> Physical Location - From the drop-down list, select the physical location that you set up for this device pool. Device mobility uses this location to assign a device pool for a roaming device.
>> Device Mobility Group - From the drop-down list, select the device mobility group that you set up for this device pool.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1SU1/cucm_b_feature- configuration-guide-for-cisco1251SU1/cucm_b_feature-configuration-guide-for- cisco1251SU2_chapter_011.html#CUCM_TK_CC7C2AFB_00