Company lists · Data refreshed August 2026

Top 25 Cloud phone system companies based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Aug 31, 2026 738 companies tracked

RevenueBase identified 738 cloud phone system companies headquartered in the United States as of August 2026 and tracks 17,065 professional contacts across them, including 6,612 with verified work emails and 5,062 with mobile numbers. New York is the largest hub.

This list covers cloud phone system 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 August 31, 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 RevenueBase Smart Search rating on every row Refreshed Aug 31, 2026 86% judged on-target in blind review

738Companies

17,065Contacts tracked

6,612Verified emails

5,062Mobile numbers

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The 25 largest cloud phone system companies based in the United States

Ranked by team size

Top 25 of 738 cloud phone system companies based in the United States, ranked by team size, largest first. Data refreshed Aug 31, 2026. RevenueBase Smart Search rates how each company's information relates to cloud phone system 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	Vonage	Indirect evidence	Holmdel, NJ, United States	1,001-5,000	3,512 contacts →
	Indirect evidence “We’re making communications more flexible, intelligent, and personal, to help enterprises the world over stay ahead.” Source: RevenueBase Database · checked Aug 31, 2026
2	GOTO	Partial evidence	Boston, MA, United States	1,001-5,000	2,325 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 Aug 31, 2026
3	Intermedia Intelligent Communications	Partial evidence	Sunnyvale, CA, United States	1,001-5,000	1,251 contacts →
	Partial 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 Aug 31, 2026
4	Spectrumvoip	Indirect evidence	Plano, TX, United States	201-500	425 contacts →
	Indirect evidence “Family owned and proudly based in Plano, Texas, SpectrumVoIP has kept businesses talking and thriving since 2007.” Source: RevenueBase Database · checked Aug 31, 2026
5	phone.com	Strong evidence	Poway, CA, United States	201-500	396 contacts →
	Strong 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 Aug 31, 2026
6	Wildix	Partial evidence	Columbus, OH, United States	201-500	337 contacts →
	Partial evidence “The First Sales-Oriented Unified Communications Solution Your communications system can either boost your revenue or create bottlenecks that slow your business down.” Source: RevenueBase Database · checked Aug 31, 2026
7	Ultatel	Partial evidence	Herndon, VA, United States	51-200	287 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 Aug 31, 2026
8	Broadsoft	Indirect evidence	Gaithersburg, MD, United States	1,001-5,000	251 contacts →
	Indirect 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 Aug 31, 2026
9	Vitel Global	Indirect evidence	South Plainfield, NJ, United States	51-200	208 contacts →
	Indirect evidence “Communication is the backbone of every business.” Source: RevenueBase Database · checked Aug 31, 2026
10	Voip Office	Partial evidence	Troy, MI, United States	201-500	165 contacts →
	Partial evidence “VoIP Office, a leading provider of Cloud based communications, makes it affordable and easy to connect to anyone, anywhere in the world.” Source: RevenueBase Database · checked Aug 31, 2026
11	Crexendo Business Solutions	Indirect evidence	Tempe, AZ, United States	51-200	141 contacts →
	Indirect 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 Aug 31, 2026
12	Panterra Networks	Partial evidence	San Jose, CA, United States	51-200	128 contacts →
	Partial evidence “PanTerra is a business-class Unified Cloud Service Provider, seamlessly delivering unified communications, team collaboration, call center, file sync & share, and business…” Source: RevenueBase Database · checked Aug 31, 2026
13	Estech Systems, Inc. ESI	Strong evidence	Plano, TX, United States	51-200	121 contacts →
	Strong evidence “Founded in 1987, Estech Systems (ESI), a Crexendo® company, delivers high-performance phone systems designed for growing businesses.” Source: RevenueBase Database · checked Aug 31, 2026
14	Star2star	Partial evidence	Sarasota, FL, United States	201-500	104 contacts →
	Partial evidence “Founded in 2006 in Sarasota, Florida, Star2Star Communications delivers the World's Leading Hybrid Cloud Communications Solution.” Source: RevenueBase Database · checked Aug 31, 2026
15	Euphoria Telecom	Indirect evidence	Sandton, United States	51-200	90 contacts →
	Indirect evidence “Euphoria Telecom is an innovative business telephone service that offers its customers unprecedented control and automated operational efficiencies.” Source: RevenueBase Database · checked Aug 31, 2026
16	Alliance Global Communications LLC	Strong evidence	Plainsboro, NJ, United States	51-200	90 contacts →
	Strong evidence “Alliance Global is a cloud-based business phone system provider exclusively for organizations that require professional communication features.” Source: RevenueBase Database · checked Aug 31, 2026
17	NUSO	Partial evidence	Clayton, MO, United States	51-200	88 contacts →
	Partial evidence “NUSO is a fast-growing and innovative communication focused Cloud services company.” Source: RevenueBase Database · checked Aug 31, 2026
18	Netfortris, A Sangoma Company	Partial evidence	Seattle, WA, United States	201-500	75 contacts →
	Partial evidence “Established more than 20 years ago, NetFortris has grown to become the leading provider of secure cloud communication solutions to forward-thinking, mid-sized and enterprise…” Source: RevenueBase Database · checked Aug 31, 2026
19	Cloudli Communications	Indirect evidence	Newark, DE, United States	51-200	74 contacts →
	Indirect evidence “Cloudli is a leading provider of next generation voice, messaging, and data communications solutions for businesses and consumers.” Source: RevenueBase Database · checked Aug 31, 2026
20	Telecomp	Strong evidence	Cushing, OK, United States	51-200	74 contacts →
	Strong evidence “TeleComp is a full-service technology company offering Enterprise VoIP phone systems, Fiber Bandwidth, Cybersecurity/Compliance and Managed Services.” Source: RevenueBase Database · checked Aug 31, 2026
21	Verve Cloud	Partial evidence	San Diego, CA, United States	51-200	64 contacts →
	Partial evidence “Verve is a client-focused nationwide provider of Cloud-Hosted Voice and Internet solutions for the SMB market.” Source: RevenueBase Database · checked Aug 31, 2026
22	Lightspeed Voice	Indirect evidence	North Venice, FL, United States	51-200	62 contacts →
	Indirect evidence “Lightspeed Voice is an AI-powered VoIP solutions provider at the forefront of transforming business communications.” Source: RevenueBase Database · checked Aug 31, 2026
23	Clarity Voice	Indirect evidence	Southfield, MI, United States	51-200	59 contacts →
	Indirect evidence “It’s no secret that staying connected and accessible is absolutely crucial in today’s business environment.” Source: RevenueBase Database · checked Aug 31, 2026
24	Monmouth Telecom	Indirect evidence	Eatontown, NJ, United States	51-200	54 contacts →
	Indirect evidence “Established in 1995 as a premier Internet Service Provider in New Jersey, Monmouth Telecom has evolved into a comprehensive provider offering cutting-edge and cost-effective…” Source: RevenueBase Database · checked Aug 31, 2026
25	West IP Communications	Partial evidence	Louisville, KY, United States	n/a	54 contacts →
	Partial evidence “West IP Communications, a wholly owned subsidiary of West Corporation, is a leading provider of cloud-based communications for the enterprise - including MPLS-based application…” Source: RevenueBase Database · checked Aug 31, 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 phone system 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 phone system companies.
Partial evidence: Its own public description names part of cloud phone system companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cloud phone system 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 738 cloud phone system companies based in the United States

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Cloud phone system companies based in the United States at a glance

As of Aug 31, 2026

38.7%Verified-email coverage

29.7%Mobile-number coverage

23.1Average contacts per company

11-50Median size (employees)

3.0%Largest-city concentration · New York

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

305

11-50

309

51-200

201-500

1,001-5,000

5,001-10,000

10001+

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 phone system 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 phone system 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 phone system 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 phone system 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, 6,612 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 August 31, 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.

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 phone system 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 phone system companies are there based in the United States?

RevenueBase identified 738 cloud phone system companies headquartered in the United States as of August 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?

Vonage, headquartered in Holmdel, tops this list with the largest team on record.

Which city has the most cloud phone system companies?

New York leads with 22 headquartered companies, followed by Miami (16) and Austin (15).

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 6,612 verified decision-maker contacts tracked across these 738 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 31, 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.