Networking battles never die; they just move to another layer in the OSI stack. That networking adage is as true with IP telephony security devices today as it was years ago with bridges and routers.

A ream of start-ups are claiming they can snuff out the ever-increasing number of Application-layer worms and viruses out there with application-specific firewalls. At the same time, established firewall vendors are countering with smarter, more application-aware security devices that can perform Deep Packet Inspection (DPI), a process that lets network managers configure rules on bit patterns deep inside a packet.

By David Greenfield at Network Magazine.

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