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  1. The UE is pre-configured with the P-CSCF address contact.
  2. The P-CSCF resolves I-CSCF to forward the registration request (via DNS).
  3. The I-CSCF queries HSS to determine which S-CSCF can host the subscriber.
  4. The request is delivered to the correct S-CSCF which acts as registrar and invokes AS for features as required.
  5. For a roaming subscriber, the flow is similar, except that the P-CSCF in this case protects the border of the visited network and the subscriber is directed to the I-CSCF in the home network.

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