One Network. Simple to Manage.

Optimize your voice and data with one streamlined, flexible network.

Flexible, per-seat pricing is available. Contact us to start creating your custom quote.


What is SIP Trunking?

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

  • Separate networks result in inefficient use of bandwidth and higher costs
  • Limited flexibility to scale to seasonal demand
  • Separate networks for voice and data
  • Wasted time managing multiple vendors
  • No flexibility to update service seasonally

After SIP Trunk

  • Pay only for what you need when you need it
  • Flexibility to increase service during peak seasons
  •  All traffic on same network reduces complexity
  •  One reliable network provider for voice and data
  • Dynamically allocate bandwidth to meet business demand


How Does It Work?


Simple, Flexible VoIP

  • Optimize your voice and data traffic over one network
  • Give your voice traffic priority to ensure calls aren’t interrupted
  • Place unlimited toll-free calls from all your connected locations
  • Protect branch locations from cyberthreats over our secure network
  • Enhance the calling features and capacity of your existing PBX phone system
  • Take your office phone features with you on virtually any mobile device


IQ SIP Trunk Network Availability Map

The CenturyLink network covers the continental United States with over 10,000 VoIP rate centers delivering over three billion minutes of VoIP conversations per month.



The Right Solution Makes All the Difference

Learn how VoIP gives you a better way to instantly increase efficiency, cut capital and maintenance costs and simplify administration, pricing and support.

VoIP How-to Guide

Discover how to choose the right VoIP solution to meet the specific communications needs of your business.

CenturyLink® VoIP Solutions

Explore cloud-based collaboration features that can simplify communications and lighten the load for your IT team.

Why VoIP?

Why has VoIP become the go-to solution for small to medium-sized businesses? Find out what IT pros have to say.

CenturyLink® Business Communicator 

Discover how to create a seamless, unified experience across mobile and computer platforms.

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