Cisco O-8637-01 - Manual (Page 4)

Chapter 19 Cisco CallManager Device Mobility
Introducing Device Mobility
19-4
Cisco CallManager Features and Services Guide
O-8637-01
Device Mobility Design
To design an efficient device mobility structure, you must first determine how to
divide the network into hierarchical groupings with distinct device mobility
properties and make the proper associations among the groupings. This is done
using device mobility groups, physical locations, device pools, and subnet-based
device mobility information.
Device Mobility Groups
Device mobility groups represent the highest level geographic entities in your
network. Depending upon the network size and scope, your device mobility
groups could represent countries, regions, states or provinces, cities, or other
entities. For example, an enterprise with a worldwide network might choose
device mobility groups that represent individual countries, whereas an enterprise
with a national or regional network might define device mobility groups that
represent states, provinces, or cities.
Movement of a device from one device mobility group to another represents the
highest level movement that Cisco CallManager recognizes.
Physical Location
Physical location represents the next division below that of device mobility group.
Physical locations provide a means of distinguishing the parameters that relate to
a specific geographical location from other parameters. For example, a Music on
Hold (MOH) server may serve a specific office or campus within the enterprise.
When a device roams to another office or campus and reregisters with
Cisco CallManager, having the device served by the MOH server at the roaming
location represents best practice. By defining the physical location according to
availability of services such as MOH, you can assure efficient and cost-effective
reassignment of services as devices move from one physical location to another.
Depending upon the network structure and allocation of services, you can define
physical locations based upon city, enterprise campus, or building.