The company that dragged the office phone into the cloud is now betting the whole switchboard on AI agents that answer, route, and read the room.
In 1999, two engineers named Vlad looked at the beige box humming in every company's phone closet - the PBX that businesses paid handsomely to buy, wire, and babysit - and asked the sort of question that starts companies: why is this hardware? Vlad Shmunis and Vlad Vendrow built their answer into a Windows app called RingZero. Twenty-seven years later the app is a public company that answers the phones for more than 600,000 businesses, trades on the New York Stock Exchange, and is on track for roughly $2.64 billion in revenue. The beige box is gone. What replaced it now talks back.
RingCentral sells something almost nobody thinks about and every business depends on: the dial tone. Not the collaboration app you open for a meeting, but the plumbing underneath - the number customers call, the text a clinic sends to confirm an appointment, the queue that routes a support call to the right agent in the right country. It runs voice in more than 100 countries, video meetings, team messaging, and full contact centers, all from one admin console and one cloud. The pitch has never been glamorous. It has been reliable.
Strip away the acronyms and the work is simple to describe and hard to do well. A business needs to be reachable. Customers call, text, email, and message; employees do it back, from desks, laptops, and phones scattered across time zones. RingCentral's job is to make all of that arrive at the right place, sound clear, and keep working at 3 a.m. on a holiday. Its flagship platform, RingEX, bundles the business phone, SMS and MMS, HD video, team messaging, and fax under a single identity, then wires it into more than 500 other tools - Salesforce, HubSpot, Microsoft, the software a company already lives in.
The second pillar, RingCX, is the contact center: the software support and sales teams use to field thousands of conversations across voice, chat, and social, with routing and analytics attached. It launched only a few years ago and has already passed 1,800 customers. For a category where switching providers means risking the number every customer already dials, that pace is unusual.
The customers are almost everyone with a phone number on a website. Small clinics and law firms sit alongside retailers, banks, universities, and enterprises running thousands of agents. What ties them together is a shared set of headaches RingCentral is built to remove: a phone system that breaks when the office empties out, support calls that pile up in a queue with no one to route them, sales reps stitching together a desk phone and a personal cell, and a manager who has no idea what was said on any of it. Replace the hardware with software, and those problems become settings rather than service calls.
The line above the fold on RingCentral's own site is the whole strategy compressed. The company has spent the last two years pointing its considerable telephony machinery at AI - not as a chatbot bolted to the side, but as agents that sit inside the call. There is AIR, an AI Receptionist that answers, qualifies, and routes inbound calls like a front desk that never takes lunch. There is AVA, a virtual assistant for routine self-service. And there is ACE, the AI Conversation Expert - formerly RingSense - that transcribes, summarizes, and scores calls so managers can hear what they missed. ACE alone reached more than 6,300 companies, growing 70%+ year over year.
The numbers behind the pivot are the interesting part. AI-powered products now account for 13% of the company's total annual recurring revenue, double what they were a year earlier. Customers who buy the AI keep spending - net retention above 100% - and pay meaningfully more per user than those who don't. RingCentral is spending more than $250 million a year on research and development to keep that going, and says most of it goes to new products rather than maintaining the old ones.
RingCentral's competitors are loud and large. Zoom and Microsoft Teams both offer phone and contact-center products; Cisco Webex, 8x8, Dialpad, Nextiva, Five9, and Genesys all want the same seat. But there is a difference worth sitting with. Zoom and Teams grew up as places to meet - video first, calling added later. RingCentral grew up as a phone company and never stopped being one. When a hospital's main line has to connect on the first ring, every time, the twenty-seven years of routing, failover, and enterprise telephony stop being boring and start being the reason you don't switch.
The rivalry gets genuinely strange in one place. RingCentral will happily turn Microsoft Teams - a direct competitor - into a full contact center using RingCentral's own software, letting companies keep the app their employees love while running the calls on RingCentral's engine. It is the kind of move only an infrastructure company makes: sell the plumbing even to the house next door.
Business phone, video, messaging, and fax on one identity, with 500+ integrations.
AI-first omnichannel contact center for support and sales teams. 1,800+ customers.
AI Receptionist that answers, qualifies, and routes inbound calls automatically.
AI Virtual Assistant handling routine self-service across voice and messaging.
Conversation intelligence that transcribes, summarizes, and scores calls. 6,300+ users.
Virtual and hybrid events and webinars, built on the former Hopin platform.
RingCentral is a subscription business at its core. It licenses seats and agent slots on a recurring basis, sold both directly and through a deep channel of carriers and resellers - AT&T, BT, Vodafone, TELUS, and others distribute or white-label its service, and a partnership with Mitel routes that vendor's customers toward RingCentral for cloud calling. The AI products layer on top as premium add-ons, which is the quiet engine of the current story: they lift average revenue per user without requiring a customer to rip anything out. Sell the plumbing, then sell the water.
RingCentral's expertise is narrow and deep: carrier-grade voice delivered as software. That focus traces back to Vlad Shmunis, who founded the company, took it public, stepped back from the chief executive role, and then returned to it to steer the AI transition himself - the founder coming back for the hard part. Co-founder Vlad Vendrow shaped the engineering culture that still defines the place: a workforce of roughly 3,100 to 3,800 people organized around the unglamorous discipline of uptime, because in this business the product is that the call connects.
In the market's shorthand, RingCentral is the full-stack incumbent of unified communications - a consistent leader in the analyst rankings for UCaaS, defending an enterprise telephony position against collaboration giants moving down into its lane and nimble startups moving up. Its bet is that the way businesses talk to customers is being rebuilt again, the way it was rebuilt when calls left the phone closet for the cloud. Last time the shift was where the software ran. This time it is who, or what, is on the line.
Shmunis and Vendrow found the company as RingZero, small-business communications software.
Roughly $45M in cumulative funding, with backers including Cisco and Silicon Valley Bank.
RingCentral goes public in September under the ticker RNG.
The platform is rebranded and the AI-first contact center launches.
Vlad Shmunis retakes the top job to lead the AI era.
AI products reach 13% of ARR as the company approaches $2.64B in revenue.
There is a tidy irony in all of it. The founders started by taking the intelligence out of the phone - moving it off the box in the closet and into the cloud. Now they are putting a different kind of intelligence back in, one that can pick up, understand a caller, and decide what happens next. The office phone was supposed to be a solved problem. RingCentral keeps deciding it isn't.