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Digital Workplace

Unified Communications as a Service (UCaaS)

Replace aging PBX hardware with managed cloud voice, video, messaging, and collaboration — so your employees can do their best work from anywhere.

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Answer the call for modern infrastructure

The on-premises PBX that ran your business for the past decade wasn’t designed for what your business needs now. With hybrid work making remote calling a daily requirement, mobile workforces need their business number on every device. Meanwhile, the FCC is sunsetting analog lines that still support elevator phones, alarm panels, and fax. And every quarter, your IT team spends more cycles maintaining hardware that should have been retired years ago. 

Cloud voice solves the problem — but only if deployed and managed properly. Off-the-shelf Microsoft Teams Voice and Webex Calling deployments give you the platforms but not the other critical elements. Among them: dial plan design, carrier services, E911 compliance, integration with your contact center, legacy line replacement, faxing, and 24x7 support.

 

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The CBTS approach

The best UCaaS platforms, on a stronger foundation

CBTS delivers and manages Microsoft Teams Voice and Webex Calling — pairing them with a proprietary voice core that gives our clients capabilities the platform vendors can’t provide on their own. 

That voice core is the CBTS Universal SIP Toolkit: a high-availability, geographically diverse Session Border Controller (SBC) infrastructure hosted in our Cincinnati and Dallas data centers. On the carrier side, it connects to Lumen, AT&T, Verizon, and other Tier 1 carriers. On the customer side, it plugs into Teams, Webex, and any other UCaaS or CCaaS platform you bring with you. It’s the layer that lets us deliver 99.99% uptime, site survivability for regulated environments, nomadic E911, spam filtering, custom call flows, and the dial plan flexibility your business needs. 

We're a Microsoft Solutions Partner for Modern Work with an Advanced Specialization in Calling for Microsoft Teams, a Cisco Gold Integrator and Provider with 260+ certifications, and an engineering-led delivery team that's been building enterprise voice environments for two decades.

UCaaS capabilities

Build a stronger foundation with digital workplace solutions tailored to your business needs.

Managed Voice Solutions


A true veteran in managed voice solutions, CBTS offers full management and co-management of the top two voice calling platforms globally. Through careful consultation, design, and implementation, we build a strong and compliant foundation. Our managed voice solutions deliver what your business needs — from dial plan design to compliance with the latest regulatory requirements, such as Kari’s Law and the RAY BAUM Act.

Calling Plan Only


Already have licensing and don’t need management? CBTS offers PTSN connectivity to Cisco Webex and Microsoft Teams. Leverage our purpose-built, proprietary voice core for delivering calls into your existing investments. By using CBTS for your calling plan, you gain access to the CBTS Routepoint self-service portal.

SIP Trunking


We offer carrier-grade SIP Trunking on our proprietary voice core, with high-availability infrastructure, direct connections to every Tier 1 carrier, and the dial plan flexibility your business needs. We own and operate the voice core that connects SIP into Microsoft Teams, Cisco Webex, and any other UCaaS or CCaaS platform you run. SIP Trunking through CBTS natively includes Routepoint, our self-service super app. It’s a competitive advantage other platform vendors struggle to replicate.

UCaaS Add-on Services


CBTS offers a coordinated set of managed add-ons, including Attendant Console for high-volume reception, POTS and analog line replacement, compliance recording for HIPAA and other regulated environments, business texting on existing business numbers, managed caller ID, faxing, and E911 dynamic location routing. While the right mix depends on industry, regulatory requirements, and legacy infrastructure, every CBTS-delivered add-on is engineered to work across both Microsoft Teams Voice and Webex Calling. Everything sits under a single contract with one accountable partner.

Where to start

Advisory engagements

A CBTS advisory is a time-bound, fixed-fee engagement designed to give you a clear answer to a specific strategic question — fast.  

CX AI

Duration: Three to four weeks

Best for: Organizations ready to move from reactive services to AI-powered customer experiences that reduce cost, improve loyalty, and actually scale. If CX is a board-level priority but the path forward isn’t clear, this is where you’ll start.

The deliverables that matter

  • A validated AI readiness scoreA
  • prioritized portfolio of CX AI use cases
  • A target architecture ready to build
  • A funded and sequenced 18 month roadmap and a business case ready for board approval
  • A governance and compliance foundation

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What success looks like

What happens when you modernize communications technology and simplify how you manage it? Three outcomes show up most often when clients engage CBTS for UCaaS.

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Cost optimization

 Cloud subscriptions replace hardware refresh cycles. A unified managed-services model replaces multiple vendor contracts. The State of Ohio saved $6.8M in communications costs in the first 24 months of their CBTS-managed UCaaS deployment.

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Improved Productivity

 Mobile workforces get their business number on every device. Remote workers get the same calling capabilities as in-office staff. Hybrid teams stop fighting their tools and start using them.

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Reduced risk

 Nomadic E911 with dynamic location routing. Site survivability for healthcare and other regulated environments. Compliance recording configured to the retention rules your industry requires. Carrier diversity through the CBTS voice core means no single point of failure.

“With UCaaS from CBTS, clients have one accountable partner for migration, integration, compliance, devices, training, and ongoing support.”

ChatGPT Image Jun 3, 2026, 09_39_55 PM

Tony King

Vice President – Digital Workplace, CBTS

Don’t take our word for it

“I love the creative, tailored solutions that are delivered in a consistent and reliable way while always doing what it takes to make things right.”

Chief Technology and Information Security OfficerFinancial Services / Banking

“My team at CBTS have been trusted partners for a long time. They provide excellent technical support and pre-sales work. Their breadth of knowledge and ability to bring in the right resources have helped us steer our technology into the future.”

Managing Director, CISO, Head of TechnologyPrivate Equity / Financial Services

“CBTS treats us like a partner and not just a customer. The technical expertise is next to none and the relationship management is some of the best I have experienced.”

Director, Telecom and Architecture ServicesHealthcare

Where UCaaS connects

 UCaaS is one part of a converged digital workplace. CBTS clients often pair their UCaaS investment with these capabilities.

Related insights 

Frequently asked questions 

What is UCaaS?

UCaaS, or Unified Communications as a Service, is a cloud-based service that replaces traditional on-premise PBX hardware with cloud-delivered voice, video, messaging, and collaboration. It’s the employee-facing side of cloud communications: the tools people use to talk to each other and get work done. Microsoft Teams Voice and Webex Calling are two of the most popular UCaaS platforms.


What is the difference between Microsoft Teams Voice and Webex Calling? Microsoft Teams Voice is the calling capability built into the Microsoft Teams collaboration platform. It’s the natural fit for Microsoft-first organizations that want a unified experience across Teams chat, meetings, and calling. Webex Calling is Cisco’s enterprise cloud calling platform, often preferred by organizations with an existing Cisco footprint or specific requirements around Cisco-engineered networking and voice. CBTS delivers and manages both, and clients often run them in combination.
What is SIP Trunking, and is it included with UCaaS? SIP Trunking is the cloud-based voice connectivity layer that links your phone system to the public telephone network. It replaces traditional analog lines and PRI circuits with carrier-grade voice over IP. Every CBTS managed UCaaS deployment includes SIP Trunking on our proprietary voice core — with direct connections to Tier 1 carriers and full integration into Teams, Webex, or any other UCaaS platform you run.
Can CBTS help us migrate from a legacy PBX or analog phone system? Yes. PBX migration is one of the most common CBTS UCaaS engagements. Every migration starts with a digital workplace assessment that documents the existing environment, then moves into UCaaS migration planning to produce a site-by-site cutover plan. The migration itself is delivered by the same CBTS engineering team that built the plan. There is no handoff between the strategy and execution teams.
What does CBTS deliver that the platform vendors don’t? CBTS doesn’t sell software. Rather, we deliver the engineering, integration, and managed services that turn Microsoft Teams Voice and Webex Calling into working enterprise voice environments. That includes migration, dial plan design, carrier services on our proprietary voice core, E911 compliance, site survivability, compliance recording, legacy analog replacement, device management, end-user training, and 24×7 support: all under one contract with one accountable partner.

Start with a conversation

The platform decision matters, but a successful UCaaS migration hinges on the work underneath it: carrier services, dial plan complexity, E911 compliance, legacy analog dependencies, and site-by-site cutover sequencing. CBTS handles all of it on the same proprietary voice core that powers our enterprise deployments, under one contract with one accountable partner.