Subscription locator function

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Suppose that the subscriber’s home network has multiple, separately addressable home subscriber servers—this would not be unusual for physically large networks or networks with a large number of subscribers. With the subscription locator function (SLF), the I-CSCF, S-CSCF, and AS have an address resolution mechanism that holds the HSS address associated with the subscriber data for a given user identity.

In general, this function is much like the Internet domain name server (DNS) that resolves the humanly understandable names (URLs and URIs) into the binary address required by the routers.