Voice over Internet Protocol (VoIP) has made great strides among US businesses during 2004 as the percentage of companies using the technology grew from 3% in 2003 to 12% in 2004, according to In-Stat/MDR. Substantially higher rates of penetration are found within the larger business segments. In-Stat/MDR forecasts that middle market VoIP penetration will be at 34% by year’s end, and at 43% in the large business segment.