By creating the actual CDRs in the network core, the operator is provided better controls
over the actual billing records, not to mention that this increases data integrity,
as there are fewer opportunities for CDR corruption when the CDR is not being passed
from the edge of the network to the core where the billing system is located.
There is also a greater ability to generate a single CDR for multiple sessions as
mentioned before. This is important because some operators may not wish to generate
several CDRs for a video conference call (which would require a CDR for each media
type being used). By collecting the billing data from each of the network elements at the
core, analysis of this data can allow operators to determine how they want to compile
the data into a single CDR, and then send that CDR to the billing presentment system
at the core.
User Profile
Every subscriber in the IMS must have a user profile. It is the user profile that defines
the services a subscriber is authorized to use, and how that subscriber will be charged
for those services. The user profile is stored in the IMS core in the home subscriber
172 Chapter 7
server (HSS). This allows operators to create the user profile when a subscriber signs
up for service.
The user profile includes the private user identity, its associated public user identities,
and the service profiles that are associated with the user.
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