SIP Trunking

On-demand scale for all your business communications needs

Our SIP trunk is built to scale, can enhance an existing PBX infrastructure, include custom routing, and provide you with a completely customizable networking solution that adapts to your needs and is more reliable than traditional PRI’s.

More reliable than a traditional PRI

Unlimited US and Canadian calling

Global phone number coverage

Certified with popular (major) PBXs

What is SIP Trunking?

SIP trunking modernizes your communications by letting your company’s PBX send and receive calls using an IP network. Improve the quality of your communications network by adopting a service that’s designed to be more reliable than PRI’s.

Are you paying for more capacity than you need?

Are you paying for more
capacity than you need?

Create a communications network that’s consistent with your company’s needs using our flexible SIP trunking service. Instantly adapt to higher demand whenever necessary while reducing upfront costs. Drive more value out of your existing PBX investment. Our SIP trunking solution is compatible with certified PBX vendors, including Avaya, Mitel, Cisco, ShoreTel, Panasonic, and many more.

A digital service for all your network routing needs

Leverage your current PBX

Drive more value out of your existing PBX system with industry-leading SIP trunking services that’s compatible with leading PBX providers like Cisco, Avaya, and more.

Support for 911 calls

Prepare for emergencies and stay compliant with 911 and Enhanced 911 (E911) calling capabilities. Emergency calls are associated with the caller’s address by phone number.

Pay for what you use

Eliminate unnecessary expenses every month by keeping your costs aligned with your capacity. Keep your costs predictable with our transparent per session pricing.

Scale on demand

Grow from 5 to 1k trunks in seconds. Get the voice and data infrastructure you need—when you need it. We make it easy for you to increase call capacity on demand.

Trusted IP infrastructure

Rely on dynamic failover and on-site redundancy. Our SIP trunks deliver calls to multiple IPs or IP providers to prevent outages and keep your communications flowing at all times.

24/7 support

Take control of your communications with ongoing, US-based support from our team of SIP trunking specialists. Our help desk is available 24/7, 365 days a year.

Why choose G12 Communications?

G12 Communications is a cloud communication service provider that helps businesses drive more value out of their communications solutions. Our customer-first approach, feature-rich solutions, and ultra-reliable network keep your employees and customers connected, productive, and collaborative.

Local customer service

Access 24/7, US-based customer support

Reliable service

99.999% uptime for our networks

Communications expertise

Decades of experience in B2B communications


Are you looking for an enterprise-grade communication solution?

G12’s SIP Trunking solution empowers modern communications with enhanced reliability and accessibility. Get started today.

SIP Trunking

Frequently asked questions

Are you interested in G12 Communications SIP Trunking solution? We put together this list of frequently asked questions to help you learn more about this service.

Still have more questions? Download our FAQ to learn more.

SIP Trunking provides virtual phone lines that allow users to make and receive calls over their public IP connection.

Yes. SIP Trunks are a replacement for traditional phone lines or PRIs.

There are several advantages to using SIP Trunks over traditional phone lines or PRIs. These advantages include:

  • Reduced Costs — SIP Trunks offer a flexible and lower cost solution to your business.
  • No Infrastructure Upgrades — You can use your IP connection, so there’s no incremental phone lines required to deploy a SIP Trunking solution.
  • On-demand Scalability — You can scale using both a per-call session vs. standard full 23 lines with a PRI, allowing you to meet demand whenever needed.
  • Domestic & Long Distance Calling— Our SIP Trunking service comes complete with both domestic and long distance (US and Canada), so you never have to worry about domestic usage charges.
  • Multi-site Deployments — Simplify the multi-site deployment process with a flexible solution that’s designed to meet your call capacity needs across the organization. 
  • Enhanced Reliability — SIP Trunking is a geo redundant and reliable solution that you can route to alternative IPs for additional redundancy.
  • Cloud PBX-friendly — SIP Trunking is fully compatible with our Cloud PBX Service, making it easy for you to transition to a robust Cloud PBX solution whenever you’re ready.

You will need a SIP Interface on your phone system if you want a connected native SIP.

We can provide SIP Trunks with a PRI interface so you don’t have to change out your interface cards on your phone system. We provide an extra device on-premise that allows you to plug the SIP Trunks into your PRI port.