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AT T, Vonage Cut Prices on Internet Calling &lt;p&gt;&lt;/p&gt;&lt;p&gt; By Justin Hyde&lt;/p&gt;&lt;p&gt; WASHINGTON (Reuters) - AT T Corp.  and Internet telephoneprovider Vonage said on Thursday they were cutting prices fortheir residential Internet calling services by \$5 per month,the strongest signs yet of a price war in the nascent market.&lt;/p&gt; 