Hackers warn about VoIP security

One thing sure to slow down VoIP's success is the lack of security. Wired has a blog post from a hacker who easily gained access to seven different corporate installations using a tool called VoIP hopper. "In seven environments that we looked at, not one customer had a firewall between voice and data," says the co-developer of the hopper tool, Jason Ostrom. "We've toasted so many of these networks it's not funny. VLAN is never, never a secure network."

As Wired's Marty Graham puts it: "Using 'a really advanced hacker technique,'--unplugging the phone and plugging in a PC, VoIP hopper mimics the Cisco data packets sent at three minute intervals and then trades a new Ethernet interface, getting the PC into the network running the VoIP." 

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