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The Access, or User Network Interface (UNI), refers to the service control interface between the user devices and the transport network (core network), and connects subscribers to their immediate service provider. 

As a guardian of the UNI interface, the

• Protects the internal resources of the core network (example Application Server) from malicious attacks and genuine but high traffic levels.
• Acts as B2B UA to bridge/bond the ingress/egress SIP sessions while maintaining distinct networks at the lower layers.
• Participates in authentication to ensure only approved and well behaved subscribers/

• UEs achieve service.
• Provides facilities for protocol repair and adaptation.
• Protects against DoS (Denial of Service attacks).
• Polices/enforces bandwidth and resource utilization.
• Facilitates NAT traversal.
• Routes UE registration request to an appropriate AS.
• Provides encryption services.

A Service Provider can use multiple