Company lists · Data refreshed September 2026

Top 25 Cloud pbx platforms software companies based in the United States

Name: Cloud pbx platforms software companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 991 companies tracked

RevenueBase identified 991 cloud pbx platforms software companies headquartered in the United States as of September 2026 and tracks 30,563 professional contacts across them, including 11,731 with verified work emails. New York is the largest hub.

This list covers cloud pbx platforms software companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 14, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 14, 2026 86% judged on-target in blind review

991Companies

30,563Contacts tracked

11,731Verified emails

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The 25 largest cloud pbx platforms software companies based in the United States

Ranked by team size

Top 25 of 991 cloud pbx platforms software companies based in the United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to cloud pbx platforms software companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Ringcentral	Partial evidence	Belmont, CA, United StatesHQ checked Sep 14, 2026	5,001-10,000	6,431 contacts →
	Partial evidence “RingCentral, Inc.(NYSE: RNG) is a global leader in AI–powered customer engagement, delivering an integrated platform for business phone, SMS, contact center, workforce engagement…” Source: RevenueBase Database · checked Sep 14, 2026
2	Vonage	Indirect evidence	Holmdel, NJ, United StatesHQ checked Sep 14, 2026	1,001-5,000	3,429 contacts →
	Indirect evidence “We’re making communications more flexible, intelligent, and personal, to help enterprises the world over stay ahead.” Source: RevenueBase Database · checked Sep 14, 2026
3	GOTO	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,320 contacts →
	Partial evidence “As the leader in cloud communications and IT, GoTo addresses real-world challenges with practical innovations and a customer-first mindset.” Source: RevenueBase Database · checked Sep 14, 2026
4	Intermedia Intelligent Communications	Strong evidence	Sunnyvale, CA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,254 contacts →
	Strong evidence “Intermedia is the cloud communications company that helps over businesses connect better, from wherever, through our AI-powered platform that includes voice, video conferencing…” Source: RevenueBase Database · checked Sep 14, 2026
5	Ooma, INC	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 14, 2026	501-1,000	606 contacts →
	Indirect evidence “Ooma delivers phone, messaging, video and advanced communications services that are easy to implement and provide great value.” Source: RevenueBase Database · checked Sep 14, 2026
6	Spectrumvoip	Indirect evidence	Plano, TX, United StatesHQ checked Sep 14, 2026	201-500	435 contacts →
	Indirect evidence “Family owned and proudly based in Plano, Texas, SpectrumVoIP has kept businesses talking and thriving since 2007.” Source: RevenueBase Database · checked Sep 14, 2026
7	Fusion Connect	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 14, 2026	201-500	425 contacts →
	Partial evidence “Fusion Connect, an industry leading cloud communications provider, removes complexity so customers can focus on running their business.” Source: RevenueBase Database · checked Sep 14, 2026
8	Serenova	Indirect evidence	Austin, TX, United StatesHQ checked Sep 14, 2026	201-500	401 contacts →
	Indirect evidence “Lifesize delivers immersive communication experiences for the global enterprise.” Source: RevenueBase Database · checked Sep 14, 2026
9	phone.com	Partial evidence	New York, NY, United StatesHQ checked Sep 14, 2026	201-500	398 contacts →
	Partial evidence “Founded in 2008 by veteran telecommunication entrepreneurs, Phone.com provides over businesses with comprehensive, flexible, and reliable cloud-based communication and…” Source: RevenueBase Database · checked Sep 14, 2026
10	Ultatel	Partial evidence	Herndon, VA, United StatesHQ checked Sep 14, 2026	51-200	285 contacts →
	Partial evidence “Ultatel delivers a powerful yet easy-to-use cloud communications suite that scales with your business-combining voice, SMS, chat, video, online fax, and contact center…” Source: RevenueBase Database · checked Sep 14, 2026
11	Broadsoft	Partial evidence	Gaithersburg, MD, United StatesHQ checked Sep 14, 2026	1,001-5,000	252 contacts →
	Partial evidence “BroadSoft, now part of Cisco, is the leading provider of software and services that enable mobile, fixed-line and cable service providers to offer Unified Communications over…” Source: RevenueBase Database · checked Sep 14, 2026
12	TCN	Indirect evidence	St. George, UT, United StatesHQ checked Sep 14, 2026	201-500	246 contacts →
	Indirect evidence “A leader in the hosted contact center technology industry since TCN, Inc.” Source: RevenueBase Database · checked Sep 14, 2026
13	Dialogic	Partial evidence	Parsippany, NJ, United StatesHQ checked Sep 14, 2026	201-500	241 contacts →
	Partial evidence “A leading cloud-optimized solutions provider for real-time communications media, applications, and infrastructure.” Source: RevenueBase Database · checked Sep 14, 2026
14	Calltower	Partial evidence	South Jordan, UT, United StatesHQ checked Sep 14, 2026	201-500	226 contacts →
	Partial evidence “Since 2002, CallTower has been at the forefront of transforming global communication, emerging as a leader in enterprise-class cloud communication, collaboration, and CX solutions.” Source: RevenueBase Database · checked Sep 14, 2026
15	Vail Systems	Partial evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	214 contacts →
	Partial evidence “For over thirty years, Fortune 500 companies in financial services, retail and hospitality, software, and wireless communications industries have relied on Vail Systems’…” Source: RevenueBase Database · checked Sep 14, 2026
16	Vitel Global	Indirect evidence	South Plainfield, NJ, United StatesHQ checked Sep 14, 2026	51-200	212 contacts →
	Indirect evidence “Communication is the backbone of every business.” Source: RevenueBase Database · checked Sep 14, 2026
17	Nuwave Communications, INC	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 14, 2026	201-500	203 contacts →
	Indirect evidence “NUWAVE Communications is a leading provider of innovative telecommunications solutions.” Source: RevenueBase Database · checked Sep 14, 2026
18	Voximplant	Strong evidence	Palo Alto, CA, United StatesHQ checked Sep 14, 2026	201-500	194 contacts →
	Strong evidence “Voximplant versatile cloud platform enables business to bring interaction to a different level.” Source: RevenueBase Database · checked Sep 14, 2026
19	rev.io	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 14, 2026	51-200	192 contacts →
	Indirect evidence “Rev.io is the only provider to seamlessly integrate native communication billing, professional service automation (PSA), and payment processing-delivering a comprehensive…” Source: RevenueBase Database · checked Sep 14, 2026
20	Synacor	Strong evidence	Buffalo, NY, United StatesHQ checked Sep 14, 2026	201-500	181 contacts →
	Strong evidence “Synacor is a cloud-based software and services company headquartered in Buffalo, New York with offices across the globe.” Source: RevenueBase Database · checked Sep 14, 2026
21	Vertical Communications	Partial evidence	Tempe, AZ, United StatesHQ checked Sep 14, 2026	201-500	175 contacts →
	Partial evidence “Vertical Communications is a leading provider of communications platforms and applications that enable critical business workflows for enterprises across a variety of industries…” Source: RevenueBase Database · checked Sep 14, 2026
22	Firstcomm	Indirect evidence	Fairlawn, OH, United StatesHQ checked Sep 14, 2026	51-200	174 contacts →
	Indirect evidence “FirstComm delivers smarter business communications and IT solutions that help organizations connect, collaborate, and scale with confidence.” Source: RevenueBase Database · checked Sep 14, 2026
23	AVOXI	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 14, 2026	51-200	166 contacts →
	Indirect evidence “At AVOXI, we believe that voice conversations are essential for businesses to connect with customers across the globe.” Source: RevenueBase Database · checked Sep 14, 2026
24	Zultys	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 14, 2026	51-200	159 contacts →
	Indirect evidence “Zultys is a premier provider of omnichannel, Unified Communications, hosted business phone services and premise-based communications systems.” Source: RevenueBase Database · checked Sep 14, 2026
25	Crexendo Business Solutions	Strong evidence	Tempe, AZ, United StatesHQ checked Sep 14, 2026	51-200	143 contacts →
	Strong evidence “Crexendo®, Inc.(NASDAQ:CXDO) is an award-winning premier provider of Unified Communications as a Service (UCaaS), Call Center as a Service (CCaaS), communication platform software…” Source: RevenueBase Database · checked Sep 14, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: cloud pbx platforms software companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names cloud pbx platforms software companies.
Partial evidence: Its own public description names part of cloud pbx platforms software companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cloud pbx platforms software companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 991 cloud pbx platforms software companies based in the United States

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Cloud pbx platforms software companies based in the United States at a glance

As of Sep 14, 2026

38.4%Verified-email coverage

30.8Average contacts per company

11-50Median size (employees)

3.0%Largest-city concentration · New York

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

387

11-50

411

51-200

135

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 991 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among cloud pbx platforms software companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “cloud pbx platforms software companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names cloud pbx platforms software companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among cloud pbx platforms software companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 11,731 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 14, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Cloud pbx platforms software companies by metro

Cloud pbx platforms software companies in New York30

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names cloud pbx platforms software companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many cloud pbx platforms software companies are there based in the United States?

RevenueBase identified 991 cloud pbx platforms software companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Ringcentral, headquartered in Belmont, tops this list with the largest team on record.

Which city has the most cloud pbx platforms software companies?

New York leads with 30 headquartered companies, followed by Miami (22) and Austin (20).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 11,731 verified decision-maker contacts tracked across these 991 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 14, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.