You may want to share where this message pops up. Also does it work in spite of this?
Bob
Has anyone had trouble setting up Vonage on a Mac with OS X Panther? I get a message when I pick up the phone receiver that my network settings are incorrect... I've followed the instructions from Vonage but no luck! After reading some of these forums I'm reluctant to call them for help.

Chowhound
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GameFAQs
GameSpot
Giant Bomb
TechRepublic