Enterprises more than doubled their SIP trunking investments in 2011 compared with 2010, but the room for further growth is almost unlimited.

According to the industry analyst firm Infonetics Research, SIP spending was up 128 percent last year, making it one of the fastest-growing telecom services in North America. But even with that kind of growth, SIP Trunking accounted for only one of 10 trunks deployed here. More...