When privacy is invoked, there is a means for the operator and any partner operator
to know the origin (defined by the private user identity) of a message. This is another
step toward preventing users from hiding their identities from the service provider. Of
course if a subscriber does succeed in hiding behind an anonymous server, for example,
the service can be denied by the operator (based on the inability to identify the private
user identity).
The purpose of privacy is to protect the identity of subscribers from transiting networks.
This would prevent capturing identity data while transiting various networks to
reach the destination network. Of course the destination network will need to establish
the identity of the subscriber prior to providing any services. The destination (or terminating
network) would still have the ability to ascertain the identity of the subscriber,
establish that the subscriber has been authenticated, and determine the services that
the subscriber is authorized to use.
Security Procedures in the IMS 149
Where privacy presents a challenge, this is lawful intercept. If a law enforcement
agency serves a subpoena on a transiting carrier, for example, the transiting carrier
may not be able to provide the true identity of a subscriber, simply because they will
not typically have access to this information. Only the home or the terminating network
will have this visibility.
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