McDewey

C H A P T E R 5 Device Mobility • Device Mobility Overview, on page 43 • Device Mobility Prerequisites, on page 47 • Device Mobility Configuration Task Flow, on page 48 • Device Mobility Interactions, on page 52 • Device Mobility Restrictions, on page 53 Device Mobility Overview Device mobility lets mobile users roam between sites, taking on the site-specific settings of the local site. When this feature is configured, Cisco Unified Communications Manager matches the IP address of a roaming device to IP subnets in the Device Mobility configuration to determine the physical location of the device so that an appropriate device pool can be assigned. The settings from this dynamically-assigned device pool override the settings in the Phone Configuration for that device and ensure that voice quality and allocation of resources are appropriate for the new phone location. For roaming mobile devices, this feature provides a more efficient use of network resources: • When a mobile user moves to another location, call admission control (CAC) can ensure video and audio quality with the appropriate bandwidth allocations for that location. • When a mobile user makes a PSTN call, the phone is routed to the local gateway. Otherwise, PSTN calls would first be routed back to the home site over IP WAN connections, and then on to a PSTN gateway at the home site. • When a mobile user calls the home location, Cisco Unified Communications Manager can assign the appropriate codec for the region. Site-Specific Settings For roaming devices, Cisco Unified Communications Manager overwrites the following device pool parameters from the device configuration with values from the dynamically assigned device pool: • Date/Time Group • Region • Location • Network Locale Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 43