See what networking services are in your area
View our high-level approaches to solving business and technology challenges
Learn how peers in your area are working with CenturyLink
SECURITY AND COMPLIANCE
Hybrid IT and Cloud
Voice and Unified Communications
Managed and IT Services
Get support, access resources, and explore products and services at centurylink.com.
Session Initiation Protocol (SIP) is a network that makes it possible to connect Voice over Internet Protocol (VoIP) phone calls to the Public Switched Telephone Network (PSTN). It can be run over your data network, allowing you to replace multiple traditional phone lines.
Before SIP Trunk
After SIP Trunk
The CenturyLink network covers the continental United States with over 10,000 VoIP rate centres delivering over three billion minutes of VoIP conversations per month.
For the third year in a row, CenturyLink (merged with Level 3 in 2017) leads the SIP trunking market with the largest installed base of trunks.
Explore cloud-based collaboration features that can simplify communications and lighten the load for your IT team.
Discover how to create a seamless, unified experience across mobile and computer platforms.
Discover how to choose the right VoIP solution to meet the specific communications needs of your business.
+44 (0) 207 400 5600
For information on our privacy practices,