The company that pulled the business phone out of the wiring closet and rebuilt it as software in the cloud.
When two engineers - both named Vlad - founded RingCentral in 1999, the business phone system was a physical object. It lived in a locked closet, ran on a PBX box, and came bundled with a carrier contract and a technician's phone number. Vlad Shmunis and Vlad Vendrow made a contrarian bet: that all of it could become software delivered over the internet. It took the better part of two decades, but the bet defined a category.
Today RingCentral, Inc. is a publicly traded American company (NYSE: RNG) headquartered in Belmont, California, employing roughly 7,400 people. It sells AI-powered cloud communications - the software that lets a company's employees call, message, meet and run a customer service center from a single platform, on any device, without owning a scrap of telecom hardware. In its 2025 fiscal year the company reported $2.5 billion in revenue and, for the first time across a full year, a GAAP profit.
The origin runs deeper than the 1999 date suggests. Before RingCentral, Shmunis founded Ring Zero Systems, whose desktop business-communications software shipped more than 25 million copies through PC makers including IBM, HP, Sony and Toshiba. That first act taught the founders something that shows up all over RingCentral's later strategy: building the product is only half the job - getting it distributed is the other half.
"RingCentral was founded to replace complex PBX hardware and carrier contracts with cloud-delivered voice, messaging and video."
- The founding premise, per company historyStrip away the acronyms and the pitch is simple. A business needs its people to communicate - with each other and with customers - reliably, from anywhere, on whatever channel the moment calls for. RingCentral provides that as a subscription. Its flagship suite, RingEX (formerly RingCentral MVP, for Message, Video, Phone), bundles a full business phone system, team messaging, and video meetings, wired into more than 300 other business tools like Salesforce, Microsoft Teams and Google Workspace. Alongside it sits RingCX, an AI-native contact center for companies that field customer calls and chats at scale.
The problem it solves is fragmentation. Before UCaaS, a mid-sized company might run a desk-phone system from one vendor, video from another, chat from a third, and a contact center from a fourth - none of them talking to each other, each with its own bill and its own outage. RingCentral's answer is consolidation: one platform, one login, one vendor, one set of analytics across every conversation.
RingCentral's customer base spans a wide range - from small and mid-sized businesses that want a professional phone system without a phone closet, to global enterprises in healthcare, finance, retail, education and professional services that need thousands of seats and strict reliability. The company reaches much of this base directly, but also through a network of carrier partners. Its 2020 agreement with Vodafone, for instance, put RingCentral in front of a base that included some 1,400 multinationals, 65,000 large enterprises and more than half a million SMEs.
The through-line is the same regardless of size: missed calls are missed revenue, scattered tools waste time, and legacy hardware is expensive to maintain and impossible to scale quickly. RingCentral's contact-center pitch, in particular, tends to start with a question most businesses can't answer - how many customer calls do you miss? - and then quantifies the cost of not knowing.
The unified communications suite: business phone, team messaging, video meetings and SMS with 300+ integrations. Formerly RingCentral MVP.
An AI-first, native contact center (CCaaS) for voice and digital customer engagement, with RingSense analytics built in.
The AI layer across the platform - call transcription, summaries, conversation analytics, agent coaching and CSAT prediction.
Enterprise omnichannel contact center built on a NICE inContact OEM, for large-scale customer service operations.
Virtual, hybrid and in-person event platform, built on assets acquired from Hopin.
A voice-first AI agent that automates front-desk call handling and customer interactions across SMS, chat and digital channels.
RingCentral is a B2B SaaS company. It charges recurring, per-user, per-month subscription fees, tiered by features, with paid AI add-ons layered on top. Revenue is overwhelmingly recurring, which makes the model predictable - and makes the 2025 turn to profitability a signal that years of scale-first spending are now converting into margin.
Distribution runs three ways: direct sales, a channel of resellers and MSPs, and wholesale carrier partnerships where telecom giants sell RingCentral under their own brands (AT&T Office@Hand, Avaya Cloud Office). It's a model that turns former rivals into a sales force.
The cloud communications market is crowded. Zoom brought its video pedigree to phone. Microsoft Teams Phone rides inside the Microsoft 365 subscription that most enterprises already pay for. 8x8 competes hard on international calling and price. Cisco Webex, Dialpad, Vonage and Nextiva all want the same seats.
RingCentral rarely wins a head-to-head on a single feature. Its position is breadth: phone, video, messaging and contact center under one roof, with the deepest integration ecosystem in the category - roughly 300+ native integrations against a rival's ~60. That breadth is the moat. When a company's software is wired into Salesforce and 299 other tools, switching vendors stops being a decision and becomes a migration project.
Its second edge is a distribution one. When legacy telecom vendors Avaya and Mitel effectively conceded the cloud, they partnered with RingCentral to migrate their own installed bases onto it - turning the incumbents' customer lists into RingCentral's funnel.
"Over 50% of RingCX customers are opting for paid AI capabilities through RingSense AI Quality Management."
- RingCentral, on AI adoptionLike most enterprise software companies, RingCentral has reoriented around AI - but its version is deliberately assistive rather than autonomous. RingSense transcribes and summarizes calls, surfaces coaching insights for agents, flags interactions that need a supervisor, and predicts customer satisfaction. The newer AI Receptionist and AIR Pro push further, handling front-desk calls and routine customer interactions outright. The framing is consistent: let the AI take the notes and the busywork so humans handle the conversations that matter.
Vlad Shmunis and Vlad Vendrow start the company to build cloud-friendly business communications.
The company raises its first institutional round to fund a cloud PBX for small and mid-sized businesses.
Cisco and Silicon Valley Bank join earlier backers as the UCaaS platform scales.
RingCentral goes public on September 27, 2013 under the ticker RNG.
Avaya Cloud Office and a strategic Vodafone agreement extend global reach.
An exclusive partnership begins migrating Mitel's cloud customers onto RingCentral.
The AI-native contact center and RingSense AI arrive; MVP is rebranded RingEX.
Full-year revenue hits $2.5B with a first GAAP profit; AI Receptionist and RingCX for Salesforce ship.
Key partners
Main competitors
Sources: Wikipedia · RingCentral Company · FY2025 Results · Crunchbase · RingCX AI (BusinessWire) · Vodafone partnership