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VLAN hopping for VoIP

Does anyone knows about a VLAN security document that explains procedures to avoid VLAN hopping when you have switches runing VoIP?

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Re: VLAN hopping for VoIP

The SAFE document located here:

http://cisco.com/en/US/netsol/ns340/ns394/ns171/ns128/networking_solutions_white_paper09186a008014870f.shtml#wp1002270

details the VLAN hopping vulnerability. Basically, you should avoid allowing traffic to traverse your trunk ports on the native VLAN.

~Zach

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