Please update your browser.

Our site no longer supports this browser. Using another one will help provide a better experience.


Simplify communications, maximise workforce productivity and enhance customer experiences with integrated voice and SIP trunking services.

Easily modernise your network and minimise costs

Lumen Voice Complete is a comprehensive, global solution offered in all 50 states and five core European countries that enables you to use SIP-based services and APIs to maximise performance, enhance reliability and simplify management without having to replace TDM technology.

VIDEO: See how Voice Complete works (3:13)

Upward view of large city building with numbers on them in front of the sky
Upward view of large city building with numbers on them in front of the sky PlayButton


Lumen remains the leader in SIP trunking

We have claimed the top spot on the Omdia SIP Trunking Service Provider Scorecard: North America for the sixth consecutive year. See how we rank in key categories such as installed base, financial stability, market share momentum and more.

Omdia SIP trunking scorecard 2021 logo with trophy


Save time and money

Save time and money

Centralise voice traffic and share idle call capacity across your organisation with built-in failover protection. Customise and streamline your enterprise communications with our expert guides and robust APIs to help stretch your budget further.

Establish a foundation for growth

Establish a foundation for growth

Leverage existing equipment to easily expand your network and adopt integrated UC&C applications for your global workforce. Our network provides the scalability to meet changing business demands and adopt new technologies.
Simplify vendor and technology management

Simplify vendor and technology management

Streamline your communications environment with a comprehensive solution, robust APIs and a single vendor and contract offering unified pricing, SLAs and invoicing.

Laptop screen open to a Lumen sign in page next to an image of a man on the phone

Features and Specifications

  • IP or TDM PBXs support direct connections to the public switched telephone network (PSTN) with no need for added conversion equipment
  • Telephone numbers, local, long distance/national, freephone, emergency services and international calling capability
  • Flexible access options via Lumen® MPLS/IP VPN, Lumen® Dedicated Internet Access or bring your own bandwidth
  • The self-service portal helps you manage voice features and change requests
  • Built-in network diversity levels and configurations appropriate for your business

Powered by GlobalLink OneLink SoftwarePowered By OneLink