Chris Avis, IT Pro Evangelist for Microsoft, has a nice article on how to get Vonage to work with the ISA firewall.
Check it out here:
http://stewedprunes.com/blogs/stewed_prunes/archive/2006/08/29/502.aspx
HTH,
Tom
Thomas W Shinder, M.D.
Site: http://www.isaserver.org/
Blog: http://blogs.isaserver.org/shinder/
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MVP — Microsoft Firewalls (ISA)