How low can they go? And how fast? AT&T announced a $5 price drop for its CallVantage voice over IP (VoIP) service today, and within hours, competitor Vonage, announced plans for an equivalent reduction. AT&T dropped the monthly price for CallVantage from $34.99 to $29.99 for unlimited local and long distance calling beginning October 1. A few hours later, Vonage said it would cut its pricing from $29.99 to $24.99 per month. Both players are still pricier than Primus' Lingo service, which offers unlimited local and long distance calling for $19.99 per month. AT&T CallVantage - http://www.att.com/callvantage Vonage - http://www.vonage.com Lingo - http://www.lingo.com/