Press Release

Verizon Retains #1 Spot, CenturyLink Jumps to #2 in IHS Infonetics SIP Trunking Scorecard

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Campbell, CALIFORNIA (August 26, 2015)—IHS today released excerpts from its 2015 IHS Infonetics SIP Trunking North American Service Provider Scorecard, which profiles, analyzes and ranks the 10 top Session Initiation Protocol (SIP) trunking service providers in North America: AT&T, CenturyLink, Cox, Fusion, IntelePeer, Level 3, Sprint, Verizon, Windstream and XO

“For the seventh straight year, Verizon leads our SIP trunking provider scorecard, followed byCenturyLink, AT&T and XO. All except CenturyLink have been near the top of the leaderboard for the past seven years and are mainstays in the SIP market, leading in service development and customer adoption,” said Diane Myers, research director for VoIP, UC and IMS at IHS.  

“CenturyLink had a big jump in this year’s scorecard due to a strong and growing installed base and improved financials. XO continues to have the largest installed base of connectivity trunks. And Level 3 strengthened its position through its acquisition of 
TW Telecom,” Myers said. 


  • Much of the attention on business VoIP services is focused on the cloud, but 
    SIP trunking is equally important for service providers as the next generation of 
    voice connectivity
  • The bulk of the SIP trunking installed base is concentrated with the large operators, because in a service market based on cost, scale is necessary for success
  • While the installed base of SIP trunks is important to providers’ overall leadership score in the scorecard, financial stability and market strategy also have a measurable impact on the standings
  • Since features aren’t a critical component of SIP trunking, providers differentiate their offerings based on security, interoperability, pricing and reliability


The annual IHS Infonetics SIP Trunking North American Service Provider Scorecard identifies providers leading the SIP trunking market in the US and Canada, and those best positioned to succeed long term. Rankings are based on criteria such as number of IP connectivity lines/trunks, financial stability, service capabilities and support options. Scores and data are displayed in charts and tables in the report, accompanied by service provider profiles describing their offerings and analysis of the individual scores. To purchase the scorecard, please visit


About IHS (

IHS (NYSE: IHS) is the leading source of insight, analytics and expertise in critical areas that shape today’s business landscape. Businesses and governments in more than 150 countries around the globe rely on the comprehensive content, expert independent analysis and flexible delivery methods of IHS to make high-impact decisions and develop strategies with speed and confidence. IHS has been in business since 1959 and became a publicly traded company on the New York Stock Exchange in 2005. Headquartered in Englewood, Colorado, USA, IHS is committed to sustainable, profitable growth and employs about 8,800 people in 32 countries around the world.

IHS is a registered trademark of IHS Inc. All other company and product names may be trademarks of their respective owners. © 2015 IHS Inc. All rights reserved.


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