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In these days, telecom operators have been constructing Next Generation Network (NGN). NGN can provide QoS and security to the communication between its users. However, the security is limited inside NGN. Therefore, when the interconnection between NGN and the Internet will be widely used in near future, it will become an important problem to solve how it protects the communications crossing over NGN and the Internet.This paper proposes a secure session provider service that protects communications crossing over NGN and the Internet in cooperation with NGN's call session control function (CSCF).The secure communication provider service protects communications between its users from four threats (Eavesdropping, Modification/Destroy of communication data, Impersonation and Phishing)To protect from above threats, we designed the secure communication provider service to meet following requirements:(1) Independency of application protocols (2) Fast establishment of secure communication session (3) Confidentiality of communication data (4) Integrity of communication data (5) Authentication of the peer The secure session provider service in this paper is based on the model that a trusted third party (TTP) authenticates the peer on behalf of the user and distributes the key for secure communication session between users.In this service, the secure session control server (sSCP) acts as TTP in cooperation with NGN's call session control function (CSCF), and provides the IPsec session between its users like user terminals (UTs) and application servers (APs). (Fig. 1

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