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Next or New Generation Networks enclose public switching telephone networks and public data communications networks. This situation has influenced the creation of one multiservice network. Instead of a proprietary, big and centralized switching infrastructure, this architecture moves the telephone exchange functionalities towards network ends. Taking into consideration this basis, the article analyzes functional and IMS security architecture, 3GPP, ETSI & UIT standards for this environment. [ABSTRACT FROM AUTHOR]

Convergence between traditional networks and networks based on packet switching and the migration process for their integration arouse new technical challenges as well as interrogations. In this article, the process of routing calls from the traditional network to a packet-switched network is described based on the analysis of a transition network scenario -- coexistence of the traditional and the packet-switched networks over Internet Protocol --. [ABSTRACT FROM AUTHOR]