This PowerPoint-based report tracks quarterly residential usage of both network/ATA-based (e.g., Vonage, Comcast Digital Voice) and client-based (e.g., Skype, Windows Live Messenger) VoIP services, including subscribers, users, households, and market share (approximately top 20 VoIP service providers overall) through the fourth quarter of 2006. In addition to overall user/subscriber estimates and market shares, this full report provides a snapshot of usage patterns and trends including number of calls, length of calls, international calling, business versus personal calling, user satisfaction, and intent to churn. It also provides analysis of the strategies of providers offering VoIP services. The report is based on data from quarterly end-user surveys and ongoing market analysis, which is included with the deliverable.