The re-registration process does not have to be as stringent as the initial registration
unless the service provider chooses for it to be.
When a subscriber is registered, the subscriber registers his or her private and public
user identity with the network. This is so the network knows how to route calls to the
subscriber, associating the private and public user identities with an actual IP address.
However, it is possible for a subscriber to have many public user identities. For example,
you may have an identity for home (your home phone number for example), while
maintaining a separate identity for work. Each of these public identities is registered
with the network either simultaneously or through separate registrations.
If you have several different devices, such as PDAs, cell phones, Blackberries, and
home PCs, you may use a different identity for each one (or the same identity). As each
of these devices connects to the network and receives a physical address, it will then
register this address along with the chosen identity. This is how subscribers could end
up with multiple devices and multiple identities.
Only one public user identity is stored within the S-CSCF at a time. All other public
user identities are stored in the service profile on the HSS. It is also possible to have
multiple public user identities registered with multiple devices (and therefore multiple
IP addresses).
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