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• 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/UE’s 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.

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