Over the next few years, Voice over IP (VoIP) is set to develop into a commercial necessity and replace traditional telephony in many areas. Even today, a cost-benefit analysis may come out in favor of choosing VoIP. However, by today's technical standards VoIP is still less secure than traditional telephony. Suitable measures can guarantee the required security and reduce the dangers to a minimal calculable risk. The firewall plays a central role in this process, as it adopts additional tasks and moves from the network edge to its core. In combination with VoIP security guidelines and standards, implementation of an appropriate security architecture helps lay a solid foundation for risk control in VoIP networks.
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