Comcast, the largest cable TV operator in the United States, began to sell Internet telephone services in three markets on June 20 13, which started one of the most important challenges experienced by traditional telephone companies.
"They are moving forward," said Mark Kay, an analyst at Kaufman Brothers. Comcast was one of the first companies to test high-speed broadband network services. They also have experience in digital video services, and they are also quite good at acquiring companies and changing hands. "