SIP Trunking

Business SIP Trunking Solutions

Integrate Both Voice and Data onto a Single, Converged Network.

You've taken the first step toward a converged network solution by purchasing CenturyLink IQ™ Networking service, which includes a multi-protocol label switching (MPLS) IP-based wide area network. Now it's time to take the next step and complete your converged solution, integrating voice with your data by adding SIP Trunk—a tested secure and reliable IP telephony solution.
You've heard about the risks of adding voice to an IP network—that it's not secure having your calls travel over the Internet. However, SIP Trunk provides features which support redundancy to help protect customers through voice switch or IP network failures, and can be purchased with CenturyLink IQ Networking Private and Enhanced Ports, so your calls can be delivered securely over our MPLS network.
With SIP Trunking, you gain all the security and reliability of MPLS without requiring expensive overhauls to your current infrastructure. Instead, you can expand your operations to sites all over the continental U.S. at a minimal cost. You also get your voice and data delivered over one of the most advanced networks available, CenturyLink's application-aware OC-192 data backbone, supported by a competitive service level agreement (SLA).

SIP Trunking Description

SIP Trunk enables the origination and termination of local voice, dedicated long-distance, as well as domestic and international toll-free service across a single broadband connection. It is designed to work in conjunction with CenturyLink IQ Networking service, which includes a secure, managed, fully interoperable and scalable suite of wide area network (WAN) services. CenturyLink IQ Networking service is comprised of advanced Internet protocol (IP)-centric, multi-protocol label switching (MPLS)-based solutions.

SIP Trunking Features

Scalability
Dedicated long-distance*
Domestic and International Toll-Free service*
Supports emergency 911 calling
Inherent Security with purchase of MPLS Private and Enhanced Ports
Switch Diversity*
Control Center Network Management Portal
Competitive service level agreements (SLAs)
Supports Local Number Portability

*Off-Net Long Distance, domestic and international Toll Free, and Switch Diversity are available as an option. Additional charges apply. CenturyLink IQ Networking ports are purchased separately from SIP Trunk service.

How SIP Trunking Works

As a SIP Trunk provider, CenturyLink is able to route voice calls from your IP-PBX across secure MPLS communication paths using Session Initiation Protocol (SIP)—a signaling protocol that delivers real-time, IP-based communications. Depending on where the calls terminate, they are either delivered to the Local Exchange Carrier in the customer's area or delivered off-network as a domestic or international long distance call. For calls to existing CenturyLink™ VoIP subscribers, they are delivered on-network, which avoids ordinary toll service fees for domestic long distance calls.

Benefits of SIP Trunking

Sessions are an efficient way to manage the cost of your call volume by aggregating multiple locations behind a single SIP trunk group
Doesn't require an expensive overhaul to your current infrastructure
Expand your operations inexpensively by leveraging existing equipment (IP-PBX) for new locations
The Control Center Network Management Portal provides customers with access to their network configurations, performance monitoring, trouble ticket submissions, and tracking from any Internet connection
Robust QoS to prioritize time-sensitive traffic such as voice, e-mail and video
Ability to port existing POTS numbers to VoIP service
Supports multiple customer locations on one service

Why Buy from CenturyLink?

CenturyLink knows how to design, build and run networks—currently running over 3 billion minutes per month of VoIP traffic across the CenturyLink IP backbone
CenturyLink manages its own network—one of the largest, most sophisticated networks in the world
CenturyLink produces a reliable, robust and fully managed service solution; sized and configured to meet your business needs to sharpen your competitive edge
CenturyLink offers simple, high-performance communications solutions that fit your growing business—plus a powerful commitment to priority business service