Company lists · Data refreshed September 2026

Top 25 Unified communication vars based in the United States

Name: Unified communication vars based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 415 companies tracked

RevenueBase identified 415 unified communication vars headquartered in the United States as of September 2026 and tracks 46,305 professional contacts across them, including 14,602 with verified work emails. Austin is the largest hub.

This list covers unified communication vars 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 22, 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 22, 2026 86% judged on-target in blind review

415Companies

46,305Contacts tracked

14,602Verified emails

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The 25 largest unified communication vars based in the United States

Ranked by team size

Top 25 of 415 unified communication vars based in the United States, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to unified communication vars: 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	AVAYA	Indirect evidence	Morristown, NJ, United StatesHQ checked Sep 22, 2026	5,001-10,000	10,510 contacts →
	Indirect evidence “At Avaya, we give our customers the freedom to take their business in the directions that benefit them most.” Source: RevenueBase Database · checked Sep 22, 2026
2	ZOOM	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 22, 2026	5,001-10,000	9,706 contacts →
	Indirect evidence “Bring teams together, reimagine workspaces, engage new audiences, and delight your customers –– all on the Zoom AI-first work platform you know and love.” Source: RevenueBase Database · checked Sep 22, 2026
3	Ringcentral	Indirect evidence	Belmont, CA, United StatesHQ checked Sep 22, 2026	5,001-10,000	6,431 contacts →
	Indirect 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 22, 2026
4	Vonage	Partial evidence	Holmdel, NJ, United StatesHQ checked Sep 22, 2026	1,001-5,000	3,429 contacts →
	Partial evidence “We’re making communications more flexible, intelligent, and personal, to help enterprises the world over stay ahead.” Source: RevenueBase Database · checked Sep 22, 2026
5	GOTO	Partial evidence	Boston, MA, United StatesHQ checked Sep 22, 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 22, 2026
6	Polycom	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,787 contacts →
	Indirect evidence “Plantronics and Polycom are now Poly.” Source: RevenueBase Database · checked Sep 22, 2026
7	Intermedia Intelligent Communications	Partial evidence	Sunnyvale, CA, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,254 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 Sep 22, 2026
8	Integra	Indirect evidence	Vancouver, WA, United StatesHQ checked Sep 22, 2026	501-1,000	1,133 contacts →
	Indirect evidence “Integra is Allstream.” Source: RevenueBase Database · checked Sep 22, 2026
9	Ooma, INC	Partial evidence	Sunnyvale, CA, United StatesHQ checked Sep 22, 2026	501-1,000	606 contacts →
	Partial evidence “Ooma delivers phone, messaging, video and advanced communications services that are easy to implement and provide great value.” Source: RevenueBase Database · checked Sep 22, 2026
10	Momentum	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 22, 2026	501-1,000	437 contacts →
	Partial evidence “We unleash human momentum with collaboration, connectivity, and communications technology.” Source: RevenueBase Database · checked Sep 22, 2026
11	Fusion Connect	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 22, 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 22, 2026
12	SKYPE	Indirect evidence	Redmond, WA, United StatesHQ checked Sep 22, 2026	10001+	423 contacts →
	Indirect evidence “The next generation of Skype from Microsoft gives you better ways to chat, call, and plan fun things to do with the people in your life every day.” Source: RevenueBase Database · checked Sep 22, 2026
13	Serenova	Partial evidence	Austin, TX, United StatesHQ checked Sep 22, 2026	201-500	401 contacts →
	Partial evidence “Lifesize delivers immersive communication experiences for the global enterprise.” Source: RevenueBase Database · checked Sep 22, 2026
14	phone.com	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 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 22, 2026
15	Bluejeans By Verizon	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 22, 2026	501-1,000	264 contacts →
	Indirect evidence “Please be advised that BlueJeans by Verizon is being sunset, concluding in the first half of 2024.” Source: RevenueBase Database · checked Sep 22, 2026
16	Broadsoft	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 22, 2026	1,001-5,000	252 contacts →
	Strong 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 22, 2026
17	Calltower	Partial evidence	South Jordan, UT, United StatesHQ checked Sep 22, 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 22, 2026
18	Whitlock	Indirect evidence	Richmond, VA, United StatesHQ checked Sep 22, 2026	1,001-5,000	226 contacts →
	Indirect evidence “Whitlock has merged with AVI-SPL to provide digital workplace technology and services to organizations locally and around the world.” Source: RevenueBase Database · checked Sep 22, 2026
19	Vitel Global	Partial evidence	South Plainfield, NJ, United StatesHQ checked Sep 22, 2026	51-200	212 contacts →
	Partial evidence “Communication is the backbone of every business.” Source: RevenueBase Database · checked Sep 22, 2026
20	Grandstream Networks	Strong evidence	Boston, MA, United StatesHQ checked Sep 22, 2026	201-500	191 contacts →
	Strong evidence “Grandstream has been connecting the world since 2002 with unified communications and networking solutions that make communicating more impactful than ever before.” Source: RevenueBase Database · checked Sep 22, 2026
21	Vertical Communications	Partial evidence	Tempe, AZ, United StatesHQ checked Sep 22, 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 22, 2026
22	Firstcomm	Partial evidence	Fairlawn, OH, United StatesHQ checked Sep 22, 2026	51-200	174 contacts →
	Partial evidence “FirstComm delivers smarter business communications and IT solutions that help organizations connect, collaborate, and scale with confidence.” Source: RevenueBase Database · checked Sep 22, 2026
23	Jive Software	Partial evidence	Austin, TX, United StatesHQ checked Sep 22, 2026	501-1,000	164 contacts →
	Partial evidence “Jive is the leading provider of modern communication and collaboration solutions for business.” Source: RevenueBase Database · checked Sep 22, 2026
24	Zultys	Strong evidence	Sunnyvale, CA, United StatesHQ checked Sep 22, 2026	51-200	159 contacts →
	Strong evidence “Zultys is a premier provider of omnichannel, Unified Communications, hosted business phone services and premise-based communications systems.” Source: RevenueBase Database · checked Sep 22, 2026
25	Panterra Networks	Strong evidence	San Jose, CA, United StatesHQ checked Sep 22, 2026	51-200	126 contacts →
	Strong 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 Sep 22, 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: unified communication vars. 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 unified communication vars.
Partial evidence: Its own public description names part of unified communication vars, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name unified communication vars. 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 415 unified communication vars based in the United States

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Unified communication vars based in the United States at a glance

As of Sep 22, 2026

31.5%Verified-email coverage

111.6Average contacts per company

11-50Median size (employees)

2.7%Largest-city concentration · Austin

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

150

11-50

156

51-200

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 415 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 unified communication vars, 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 “unified communication vars”. 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 unified communication vars), 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 unified communication vars, 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, 14,602 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 22, 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 unified communication vars, 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 unified communication vars are there based in the United States?

RevenueBase identified 415 unified communication vars 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?

AVAYA, headquartered in Morristown, tops this list with the largest team on record.

Which city has the most unified communication vars?

Austin leads with 11 headquartered companies, followed by Miami (10) and Dallas (8).

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 14,602 verified decision-maker contacts tracked across these 415 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 22, 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.