Comcast (Nasdaq: CMCSA) and Verizon (NYSE: VZ) continue to be the VoIP providers of choice for businesses, according to Infonetics Research's annual North America Business VoIP Service Leadership Scorecard. A key piece of growth in Comcast's VoIP portfolio is its Business VoiceEdge service. In first quarter, the cable MSO's business service revenue rose 27.5 percent to $741 million. Article