Title	A Secure System for Data Collection in GSM Networks
Author	Martin Koutny, Jiri Misurec, Petr Mlynek
Citation	Vol. 8  No. 11  pp. 24-28
Keywords	GSM, GPRS, secure transfer, VPN

Title	Overlay Networks: Overview, Applications and Challenges
Author	Jaime Gal?n-Jim?nez, Alfonso Gazo-Cervero
Citation	Vol. 10  No. 12  pp. 40-49
Keywords	Overlay Multicast, Overlay topologies, Content Distribution, P2P, VPN

Title	Evaluation of tunnel layer impact on VOIP performances (IP – MPLS – MPLS VPN – MPLS VPN IPsec)
Author	Faycal Bensalah, Najib El Kamoun, Ayoub BAHNASSE
Citation	Vol. 17  No. 3  pp. 87-92
Keywords	IP, VPN, MPLS VPN, IPsec MPLS, VOIP, GNS3, IP SLA, Scalability.

Title	A Comparison of VoIP Performance Evaluation on different environments Over VPN Multipoint Network
Author	Adel Alharbi, Ayoub Bahnasse, and Mohamed Talea
Citation	Vol. 17  No. 4  pp. 123-128
Keywords	VPN multipoint, VoIP, Delay, Jitter, Packet loss, MOS, Simulation, Emulation, Security