The service
profiles associated with each of the identities is also stored within the same S-CSCF
(downloaded from the HSS at registration time).
This is paramount to providing ubiquitous service no matter where a subscriber is
located. Again this model was taken from the wireless community, where all handsets
register their location with their home network so that calls can be routed to the handset
no matter where the subscriber is located.
A service profile is also identified through the use of a service identifier. A public
service identity is associated with the service profile in the HSS. The public service
identity can be shared across multiple devices as mentioned previously, and as illustrated
in Figure 4.4.
Figure 4.4 Relationship between subscriptions, private and public user identities, and service profiles
Subscription
Public
user
identity #1
Public
user
identity #2
Public
user
identity #3
Private
user
identity #1
Private
user
identity #2
Service
profile #1
Service
profile #2
Addressing in the IMS 103
As is the case with user identities, services also have public identities. The public
service identities are used to access services such as conference bridges and whiteboard
applications, as an example. They are then used to identify the services a subscriber is
allowed to use within the network.
Service identities are not associated with any user identities other than identifying
what services they are allowed to use, as these are actually network services and not
part of subscriptions.
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