Title	Lightweight Security Mechanism for PSTN-IP Telephony Convergence
Author	Wojciech Mazurczyk, Zbigniew Kotulski
Citation	Vol. 7  No. 5  pp. 35-41
Keywords	VoIP security, PSTN-IP Telephony interconnections, network steganography, audio watermarking

Title	Scenarios for the Transition to NGN
Author	Negin Maleki, Hamed Shahbazi Fard* and Mahdi Movassagh
Citation	Vol. 17  No. 4  pp. 115-122
Keywords	Component, Migration Strategy, Migration Scenario, PSTN, IP, IMS, NGN.