Ralf Ackermann

A method for establishing a data connection between a first and a second processor and means for exchanging data

Ralf Steinmetz, Dieter Rohrdrommel, Juergen Schlesinger, 2000 .

Evaluating and improving firewalls for IP-telephony environments

Ralf Steinmetz, Ralf Ackermann, Utz Roedig, 2000 .

Trust and context : two complementary concepts for creating spontaneous collaborative networks and intelligent applications

Ralf Steinmetz, Andreas Mauthe, Ivan Martinovic, 2004 .

Intrusion detection systems for IP telephony networks

Utz Roedig, Jana Dittmann, Martin Steinebach, 2002 .

A Distributed Firewall for Multimedia Applications

Ralf Steinmetz, Christoph Rensing, Ralf Ackermann, 2000 .

SSS4it — Secure Session Setup für Internet-Telefonie

Ralf Steinmetz, Christoph Rensing, Lars Wolf, 2000 .