N (Normative)  Enhancements to the access security to enable SIP Digest |R8|  Word‑p. 68

N.1  SIP Digest

N.2  Authentication

N.2.1  Authentication Requirements

N.2.1.1  Authentication Requirements for Registrations

N.2.1.2  Authentication Requirements for Non-registration Messages  Word‑p. 71

N.2.2  Authentication failures  Word‑p. 73

N.2.2.1  User Authentication failure

N.2.2.2  Network authentication failure

N.2.2.3  Incomplete Authentication

N.2.3  SIP Digest synchronization failure

N.2.4  Network Initiated authentications  Word‑p. 74

N.2.5  Support for dynamic password change

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