Vonage and Issues with SBC DSL

Network World's Mike Gibbs article about Vonage is rather indicting. While some may want to put the burden on SBC, why do other companies not have the same issues. More important, why would a company as customer savvy as Yahoo be betting on SBC if problems like this exist. Sorry, the trouble is the Vonage infrastructure, or lack of it, not the dumb pipe, stupid network of SBC.