Everything your small business needs for efficient voice performance. 


At Optimum, we know SIP Trunking is an essential part of your small business. That’s why our systems work with an extensive list of SIP Trunk Providers, some of the best around. 

PRI Trunking is also a critical part of any business, but only if it’s flexible and adaptable. Enter our flexible PRI Trunk, which allows you to port your current numbers, add or remove phone sessions and DID blocks all while having  up to 24 call sessions at once. 


We want to help your business shift when needed. That’s why we have flexible PRI trunking, which allows 24 simultaneous call sessions at a time, porting your current numbers at no extra charge, and bringing your traditional PRI PBX systems with you.

  1. 24 simultaneous call sessions
    • Business needs change, and that includes your PRI Trunking demands. And that’s why Optimum offers the ability to have up to 24 simultaneous call sessions and up to 100 Direct Inward Dial (DIDs) telephone numbers.
  2. Port your numbers at no extra charge
    • Port your current numbers at no extra charge. Make changes with ease. And you don’t need an IT person. We make it easy to add or remove additional phone sessions or DID blocks, thanks to our easy-to-understand Setup Guide.
  3. Bring your traditional PRI PBX
    • You can also bring your traditional PRI PBX phone systems to our PRI service and have up to 23 simultaneous call sessions. Along with this, you get all the calling features you need for daily business.


Optimum’s Business Trunking works with a huge list of the most common IP PBX providers, including Cisco CME, NORTEL, and Panasonic (NSE and TDE series). Our trunking has been tested and certified for this, so it will work with your existing PBX provider. Get up to 23 simultaneous call sessions with a PRI interface if your business has an existing PBX phone system.

And when you switch to Optimum, you won’t have to pay extra fees for new equipment or hardware.


60-Day Guarantee

We’re so confident in our services that we offer a 60-day, money-back guarantee. If you’re not totally satisfied, we’ll refund you.

24/7/365 Customer Support

Our U.S.-based customer service team is always ready to support your business. Contact us anytime day or night - even on holidays.

Same Day Service

We strive to keep you connected, but If an issue with your service occurs, we'll start working on it the same day - even if it requires an on-site visit.


Secure Internet

Superfast Internet with security built-in.

Business Hosted Voice

Give your business the complete cloud phone system— hardware and software that works together seamlessly.


Get intelligent WiFi that offers separate guest and private networks, content filtering, and custom branding.

Service Plans

Get technical support for all the systems and devices your business relies on.

Business TV

With a wide variety of packages, we’re confident we have the television services to fit your business needs.



Our solutions will help guide you through complex IT agendas, and stay confidently connected.

Learn more about the best SIP trunk provider

If your business requires four or more business phone lines, business trunking from Optimum Business saves your business up to 50% from traditional T-1 based phone services. Optimum Business is rated as the best SIP trunking provider, and allows you to only pay for the number of simultaneous call sessions your employees use rather than paying for individual phone lines. Whether hiring more consultants, or working remotely during the off season, our trunking services make it easy to add and remove lines, letting you scale back costs when you need to and ramp them up just as easily. Optimum Business provides SIP trunking that can handle your Business's call volume. Optimum Business offers a range of voice business packages, including voice, business hosted voice, and business trunking. Plus, only Optimum Business offers a same-day guarantee. As a small business phone service provider, Optimum Business promises we’ll begin working on your service call the same day you report it, even if an onsite visit is required. We also provide actively monitored battery backup, meaning that even if you lose power, you can still run your business – thanks to Optimum Business's battery-powered backup system. An excellent provider can do much more than you thought it could.

Learn all about SIP trunk providers

SIP trunking has become a wildly popular business tool – and your small business should consider investing in it, too. SIP stands for Session Initiation Protocol. Let’s break that down – simply put, SIP trunking is a way to send voice and other communications via the internet. SIP functions alongside an IP-enabled private branch exchange, or PBX. Basically, SIP trunk providers are used in place of phone lines. Why is all of this important? An SIP trunk increases productivity while reducing costs – and yes, it’s more reliable, too. Before SIP trunking came about, calls were transmitted via Public Switched Telephone Networks. This slowed down communication and was expensive to maintain and repair. Not anymore. Partner with Optimum Business, rated as the best SIP trunk provider around.