One opinion.....
What the Vonages of the world are doing is a bastardization of SIP. They are not allowing direct inbound SIP calls , nor do they participate in ENUM. Vonage has taken aim at ISPs who block or hinder VoIP, so we as consumers should take aim at the Vonages who are blocking open SIP inbound calls. What is good for the goose is good for the gander.
Why is this bad? For more information:
http://markosjal.blogspot.com/
Mark
Vonage users READ THIS! 
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