Seamless vertical handover of VoIP calls based on SIP Session Border Controllers. - Stefano Salsano; Luca Veltri; Gianluca Martiniello; Andrea Polidoro (ICC, 2006)

Wireless LAN-3G Integration: Unified Mechanisms for Secure Authentication based on SIP. - Luca Veltri; Stefano Salsano; Gianluca Martiniello (ICC, 2006)