Figure 7.5 Structure of the user profile
Barring indicator
SIP URI
TEL URI
Public user identity A
Public user identity B
Public user identity C
Service profile 1
Service profile 2
Service profile 3
User profile
Online and Offline Charging in the IMS 173
The S-CSCF then uses this information to police the services a subscriber is authorized
to request. For example, if the user profile does not authorize messaging
services, and the subscriber attempts to initiate messaging through the sending of
a MESSAGE, the S-CSCF examines the SDP portion of the message, and when it
determines that messaging is described in the SDP as the media for the session,
the S-CSCF rejects the INVITE and sends the appropriate response back to the
subscriber.
The use of a user profile provides many opportunities for a service provider. A subscriber
may have multiple devices and multiple uses for each of their devices. Some of
their uses may be business, while others are strictly pleasure. By providing the ability
to define multiple identities under one account, a subscriber can manage all of their
communications for both work and personal use using one account, rather than multiple
accounts for each identity.
Many wireless providers provide this capability today, but not with the same versatility,
because they may not have the ability to support all media types (although this
is rapidly changing).
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