Cisco Systems Caller ID Box O 8637 01 User Manual

C H A P T E R  
19  
Cisco CallManager Device Mobility  
The Device Mobility feature permits devices to dynamically associate with  
Cisco CallManager for location based information.  
This chapter provides an overview of the Device Mobility feature and includes  
information on the following topics:  
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Chapter 19 Cisco CallManager Device Mobility  
Introducing Device Mobility  
Network Locale  
Device Mobility Group  
Location  
Physical Location  
Connection Monitor Duration  
Device Mobility Calling Search Space  
AAR Calling Search Space  
AAR Group  
The Common Profile window now contains these parameters that were formerly  
included in the device pool:  
Common Profile Settings  
Common Profile Name  
Softkey Template  
Network Hold MOH Audio Source  
User Hold MOH Audio Source  
User Locale  
Multilevel Precedence and Preemption (MLPP) Information  
MLPP Indication  
MLPP Preemption  
MLPP Domain  
Note  
Device pools that were already configured automatically migrate to the new  
structure as part of the upgrade to Cisco CallManager Release 4.2.  
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Chapter 19 Cisco CallManager Device Mobility  
Introducing Device Mobility  
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.  
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Chapter 19 Cisco CallManager Device Mobility  
Introducing Device Mobility  
Device Pools  
After the device mobility groups and physical locations are identified, you can  
associate them with device pools. Each device pool contains the set of parameters  
that apply to devices, and adding the device mobility group and physical location  
ties the device pool to those entities.  
Device Mobility Information  
In the final step in designing a device mobility structure, you associate subnets  
with the device pools that contain the device mobility group and physical location  
information. When a phone registers and obtains an IP address, the system  
compares the address to device mobility subnets that are associated with one or  
more device pools. The matching subnet becomes the device home subnet for the  
purpose of device mobility.  
Phone Configuration  
After the device mobility structure is in place, you can turn device mobility on for  
IP phones that are provisioned to be mobile.  
Device Mobility Process  
This section describes how Cisco CallManager manages phone registration and  
assignment of parameters for device mobility.  
Following initialization, the Device Mobility feature operates according to the  
following process:  
1. A phone device record gets created for an IP phone that is provisioned to be  
mobile, and the phone gets assigned to a device pool. The phone registers  
with Cisco CallManager, and an IP address gets assigned as part of the  
registration process.  
2. Cisco CallManager compares the IP address of the device to the subnets that  
are configured for device mobility in the Device Mobility Info window. The  
best match uses the largest number of bits in the IP subnet mask (longest  
match rule). For example, the IP address 9.9.8.2 matches the subnet  
9.9.8.0/24 rather than the subnet 9.9.0.0/16.  
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Chapter 19 Cisco CallManager Device Mobility  
Introducing Device Mobility  
3. If the device pool in the phone record matches the device pool in the matching  
subnet, the system considers the phone to be in its home location, and the  
phone retains the parameters of its home device pool.  
4. If the device pool in the phone record does not match the device pools in the  
matching subnet, the system considers the phone to be roaming and subject  
to reregistration and reapplication of device parameters. Table 19-1 describes  
the possible conditions that can arise and the system responses.  
Table 19-1 Device Mobility Conditions and Responses  
Condition  
System Response  
The physical location of the phone’s home The system does not consider the  
device pool stays the same as the physical phone to be roaming, and the  
location of the device pools that are  
associated with the matching subnet.  
phone remains registered with the  
home device pool.  
Note  
Although the phone may have  
moved from one subnet to another,  
the physical location and  
associated services have not  
changed.  
The matching subnet has a single device  
The system considers the phone to  
pool that is assigned to it; the device pool be roaming. It reregisters with the  
differs from the phone’s home device pool, parameters of the device pool for  
and the physical locations differ.  
the matching subnet.  
The physical locations differ, and the  
The system considers the phone to  
matching subnet has multiple device pools be roaming. The new device pool  
assigned to it.  
gets assigned according to a  
round-robin rule. Each time that a  
roaming devices comes in to be  
registered for the subnet, the next  
device pool in the set of available  
device pools gets assigned.  
Physical location gets defined for the home The physical location has not  
device pool but is not defined for the  
device pools that are associated with the  
matching subnet  
changed, so the phone remains  
registered in the home device pool.  
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Chapter 19 Cisco CallManager Device Mobility  
Introducing Device Mobility  
Table 19-1 Device Mobility Conditions and Responses (continued)  
Condition System Response  
Physical location that is not defined for the The system considers the phone to  
home device pool gets defined for the  
device pools that are associated with the  
matching subnet  
be roaming to the defined physical  
location, and it registers with the  
parameters of the device pool for  
the matching subnet.  
A subnet gets updated or removed.  
The rules for roaming and  
assigning device pools get applied  
by using the remaining subnets.  
5. Special conditions apply for movement within device mobility groups, as  
described in Table 19-2.  
Table 19-2 Device Mobility Group Conditions and Responses  
Condition  
System Response  
A device roams and reregisters  
with a different device pool and  
The system considers the phone to be  
roaming. It reregisters with the parameters  
physical location, but within the of the device pool for the matching subnet,  
same device mobility group.  
including the Device Mobility Calling  
Search Space, AAR Calling Search Space,  
and AAR Group.  
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Chapter 19 Cisco CallManager Device Mobility  
System Requirements for Cisco CallManager Device Mobility  
Table 19-2 Device Mobility Group Conditions and Responses (continued)  
Condition  
System Response  
A device roams and reregisters  
with a different device pool and  
physical location in a different  
device mobility group.  
The phone gets assigned the device pool  
settings of the roaming device pool;  
however, these device mobility parameters  
retain the values that are specified in the  
device record:  
Device Mobility Calling Search Space  
AAR Calling Search Space  
AAR Group  
A device roams, and a device  
mobility group does not get  
Because the phone is considered to be  
roaming, it gets reregistered with the  
defined for the home or roaming parameters of the device pool for the  
device pool.  
matching subnet, including the Device  
Mobility Calling Search Space, AAR  
Calling Search Space, and AAR Group.  
System Requirements for Cisco CallManager Device  
Mobility  
Cisco CallManager Device Mobility requires the following software components  
to operate:  
Cisco CallManager 4.2 or later  
Microsoft Windows 2000  
Microsoft Internet Explorer or Netscape Navigator:  
Netscape 4.7 and 6.7 and Internet Explorer 5.5 and 6.  
The following phones support Cisco CallManager Device Mobility:  
Cisco IP Phone 7900 series  
Cisco IP Phone Model 30 VIP  
Cisco IP Phone Model 12 SP+  
Computer Telephony Integration (CTI) Ports  
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Chapter 19 Cisco CallManager Device Mobility  
Interactions and Restrictions  
Cisco IP Communicator  
Interactions and Restrictions  
The Device Mobility feature depends on the IP address of the device that registers  
with Cisco CallManager. If the device is assigned an IP address by using  
NAT/PAT, the IP address that is provided during registration may not match the  
actual IP address of the device.  
If Device Mobility Mode is set to Default in the IP Phone Configuration window,  
the Device Mobility Mode service parameter determines whether the device is  
enabled for the device mobility feature. For information on the service  
parameters, see the “Service Parameters Configuration” in the  
Cisco CallManager Administration Guide. For information on configuring  
devices, see the “Cisco IP Phone Configuration” in the Cisco CallManager  
Administration Guide.  
Configuration Checklist for Device Mobility  
Table 4-1 shows the steps for configuring the Cisco Device Mobility.  
Figure 19-1 Cisco CallManager Device Mobility Checklist  
Configuration Steps  
Related Procedures and Topics  
Step 1  
Verify that the Cisco CallManager service Service Parameters Configuration, Cisco  
is enabled in the Service Parameters  
window.  
CallManager Administration Guide  
Step 2  
Step 3  
Step 4  
Configure device mobility groups in the  
Device Mobility Groups window.  
Device Mobility Group Configuration, Cisco  
CallManager Administration Guide  
Configure physical locations in the  
Physical Location window.  
CallManager Administration Guide  
Configure available roaming subnets and  
Device Mobility Info Configuration, Cisco  
assign device pools in the Device Mobility CallManager Administration Guide  
Info window.  
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Chapter 19 Cisco CallManager Device Mobility  
Where to Find More Information  
Figure 19-1 Cisco CallManager Device Mobility Checklist (continued)  
Configuration Steps Related Procedures and Topics  
Step 5  
Turn the mobility mode to on for devices  
that will be permitted to roam.  
Cisco IP Phone Configuration, Cisco  
CallManager Administration Guide  
Step 6  
Configure phones to use device mobility.  
Cisco IP Phone Configuration, Cisco  
CallManager Administration Guide  
Where to Find More Information  
Related Topic  
Device Pool Configuration, Cisco CallManager Administration Guide  
Service Parameters Configuration, Cisco CallManager Administration Guide  
Physical Location Configuration, Cisco CallManager Administration Guide  
Device Mobility Group Configuration, Cisco CallManager Administration  
Guide  
Device Mobility Info Configuration, Cisco CallManager Administration  
Guide  
Configuring Cisco IP Phone, Cisco CallManager Administration Guide  
Common Profile Configuration, Cisco CallManager Administration Guide  
Additional Cisco Documentation  
Cisco CallManager Administration Guide  
Cisco CallManager System Guide  
Cisco CallManager Serviceability System Guide  
Troubleshooting Guide for Cisco CallManager  
Cisco CallManager Features and Services Guide  
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