8.5. Registration

In this section, we describe the registration process in detail. The goal of registration was briefly mentioned in Chapter 6 , namely to create and maintain binding in a SIP registrar. Such binding allows the establishment of IP communication sessions to the subscriber using a public user identity. The binding is used to forward the IP communication sessions to the subscriber’s current IP address. Before looking into the registration procedure, we consider the subscriber data structure in HSS. An IMS subscriber is provisioned in HSS with one or more of each of the following two identification items:
IMS public user identity (IMPU). IMPU is used to identify an IMS subscriber over the public communication network, e.g. to establish ...

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