Subscription
Private
user
identity
Public
user
identity
Public
user
identity
Public
user
identity
Service
profile
Service
profile
Figure 4.3 Relationship between the private user identity, public user identity, and a subscription
102 Chapter 4
As networks mature and the IMS implementation becomes more wide scale, the network
will be able to monitor users??™ locations based on their movements around the network.
For example, the network could determine by tracking the handset movements
that a subscriber has left their office and is now commuting. Given this condition, the
user identity for work may dictate that all work calls be routed from the user??™s desk to
the user??™s cell phone.
However, as a subscriber arrives home, the network could sense this change (again
based on Presence configurations) and begin directing all work calls to the subscriber??™s
voice mail service. At the same time, the network could direct all personal calls from
the cell phone to the subscriber??™s home phone.
This is a rather unique capability provided by the IMS model and the various call
session control functions throughout the network. Working with various application
servers, the possibilities are endless.
While a subscriber can have multiple user identities, all identities (both public and
private) must be registered within the same registrar (the same S-CSCF).
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