Based on studies, the sales of IP phones worldwide has increased in 2010. A big factor in this development is the shift towards IP telephony systems by a majority of phone companies worldwide. Based on sales, corded IP phones seem to be enjoying lot of sales and is seen to further remain dominant within the enterprise IP phone sector for the forecast period. According to research forecasts don by In-Stat, the shipments for IP phones for both the business and consumer sector will reach more than 40 million units by 2015, which is strong indicator that IP telephony will become the main telephony system in just a few years.