Therefore, identity within
the IMS is based on a subscription and not necessarily an individual. Of course, there
will be an individual (or individuals) associated with a subscription, and they will be
responsible for payment for services rendered, but this does not prevent fraudulent
access to a subscription.
Subscription identities are used throughout the IMS for virtually every transaction
that takes place within the IMS. Beginning with the registration process, and including
each and every request, subscription identity is a crucial and mandatory part of SIP
messages within the IMS domain (and usually within VoIP domains as well).
In fact, the user identity provides much flexibility in the offering of services within
an IMS implementation. A service provider can provide one subscription to a subscriber
but offer many different public identities under that one account. The subscriber is
then able to use multiple identities for different applications.
For example, a subscriber may want to maintain one identity strictly for e-mail communications,
while using another identity for work-related communications. The subscriber
may wish to use yet another identity for personal use, such as gaming and Web
browsing. Each identity can be tracked by the service provider with usage captured for
each service the subscriber uses with each identity.
The service provider can also offer more flexible rate plans by building service profiles
for each of the identities.
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