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An IMS Subscription stores the subscription data for an IMS user. This data is assumed to indicate the association of public and private identities and which Public User Identities within a subscription are shared and which are not. An IMS subscription supports multiple IMS users.
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Figure 1: Relationship between Private and Public User Identities
Public identities can be grouped together to form an implicit registration set. The public identities in this set get implicitly registered via single IMS registration of one of the Public User Identity's in that set. No single public identity shall be considered as a master to the other Public User Identities. A simple diagram of implicit registration of Public User Identities is depicted below.
Figure 2: Implicit Registration Set
Public User Identities may be shared among multiple Private User Identities within the same IMS subscription. Hence a Public User Identity may be simultaneously registered from multiple UEs that use different Private User Identities and different contact addresses.
The following relationships are possible between Public User Identities and Private User Identities in IMS deployments:
Figure 4: Additional Public User Identity
Figure 5: Multiple Contacts Bound to Single PUID