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The mobile broadband industry’s rapid migration to LTE has opened the door to malicious and non-malicious threats as a result of fundamental vulnerabilities in the all-IP LTE architecture. Consequently, security must be a foundational element of LTE network deployments. As the adoption of IPsec encryption for transporting LTE traffic continues to grow significantly, there is increasing need for a security gateway. This white paper discusses the evolving threat landscape, the economics and performance requirements of security solutions, and the role of the security gateway in LTE networks as subscribers ramp up by the millions every quarter and VoLTE services start to emerge.