Company lists · Data refreshed September 2026

Top 25 Unified communications companies worldwide

Name: Unified communications companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 3,432 companies tracked

RevenueBase identified 3,432 unified communications companies worldwide as of September 2026 and tracks 114,011 professional contacts across them, including 33,671 with verified work emails. The United States is the largest market and London the largest hub.

This list covers unified communications companies worldwide, 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. Country and city lists for unified communications companies follow the table.

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

3,432Companies

114,011Contacts tracked

33,671Verified emails

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The 25 largest unified communications companies worldwide

Ranked by team size

Top 25 of 3,432 unified communications companies worldwide, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to unified communications 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	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	MITEL	Indirect evidence	Kanata, ON, CanadaHQ checked Sep 22, 2026	1,001-5,000	3,442 contacts →
	Indirect evidence “Powering more than 2 billion connections every day, Mitel helps businesses connect, collaborate and take care of customers.” Source: RevenueBase Database · checked Sep 22, 2026
5	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
6	Spectrum Business	Indirect evidence	Stamford, CT, United StatesHQ checked Sep 22, 2026	10001+	3,044 contacts →
	Indirect evidence “Our story starts with understanding that connectivity powers everything you do, and we make it stronger.” Source: RevenueBase Database · checked Sep 22, 2026
7	TCS	Partial evidence	Jefferson City, MO, United StatesHQ checked Sep 22, 2026	n/a	2,576 contacts →
	Partial evidence “With In-store media solutions to help you connect with your customers and grow your business, TCS delivers communication solutions that will take your business to the next level.” Source: RevenueBase Database · checked Sep 22, 2026
8	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
9	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
10	ASCOM	Indirect evidence	Baar, SwitzerlandHQ checked Sep 22, 2026	1,001-5,000	1,600 contacts →
	Indirect evidence “Our vision is a world where the right information moves people forward.” Source: RevenueBase Database · checked Sep 22, 2026
11	GAMMA	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	1,001-5,000	1,568 contacts →
	Partial evidence “Gamma Communications is a leading provider of technology-based communication solutions across Europe.” Source: RevenueBase Database · checked Sep 22, 2026
12	Tulip Telecom	Partial evidence	New Delhi, IndiaHQ checked Sep 22, 2026	1,001-5,000	1,481 contacts →
	Partial evidence “Tulip Telecom Ltd.(BSE: 532691/NSE: TULIP) is India’s leading Enterprise Communications Service provider.” Source: RevenueBase Database · checked Sep 22, 2026
13	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
14	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
15	Bandwidth INC	Partial evidence	Raleigh, NC, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,128 contacts →
	Partial evidence “Bandwidth is the universal communications platform that simplifies how businesses deliver integrated global experiences.” Source: RevenueBase Database · checked Sep 22, 2026
16	Wavenet	Indirect evidence	Solihull, United KingdomHQ checked Sep 22, 2026	1,001-5,000	927 contacts →
	Indirect evidence “Since we’ve been helping organisations stay connected, protected and ready for what comes next.” Source: RevenueBase Database · checked Sep 22, 2026
17	Yealink	Partial evidence	Xiamen, ChinaHQ checked Sep 22, 2026	1,001-5,000	773 contacts →
	Partial evidence “Yealink (Stock Code: 300628) is a global brand that specializes in video conferencing, voice communications and collaboration solutions with best-in-class quality, innovative…” Source: RevenueBase Database · checked Sep 22, 2026
18	Onecom	Partial evidence	Fareham, United KingdomHQ checked Sep 22, 2026	501-1,000	655 contacts →
	Partial evidence “Onecom is the UK’s leading business telecoms and cloud communications provider managing over a million services for business customers - delivering communication services and…” Source: RevenueBase Database · checked Sep 22, 2026
19	Alianza	Partial evidence	Pleasant Grove, UT, United StatesHQ checked Sep 22, 2026	501-1,000	606 contacts →
	Partial evidence “Empowering service provider growth with the world’s most trusted Intelligent Communications Fabric.” Source: RevenueBase Database · checked Sep 22, 2026
20	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
21	Telepacific Communications TPX Communications	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 22, 2026	1,001-5,000	542 contacts →
	Partial evidence “TelePacific company is now TPx Communications.” Source: RevenueBase Database · checked Sep 22, 2026
22	C3ntro Telecom	Indirect evidence	Miguel Hidalgo, MexicoHQ checked Sep 22, 2026	501-1,000	507 contacts →
	Indirect evidence “Somos C3NTRO, una empresa mexicana de clase mundial con 15 años de experiencia en Telecomunicaciones.” Source: RevenueBase Database · checked Sep 22, 2026
23	Sangoma	Partial evidence	Markham, ON, CanadaHQ checked Sep 22, 2026	201-500	454 contacts →
	Partial evidence “Sangoma Technologies Corporation (TSX: STC; Nasdaq: SANG) is a global leader in essential business communications.” Source: RevenueBase Database · checked Sep 22, 2026
24	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
25	NEW Horizon Communications	Partial evidence	Concord, MA, United StatesHQ checked Sep 22, 2026	51-200	435 contacts →
	Partial evidence “NHC is THE communications STACK provider™.” 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 communications 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 unified communications companies.
Partial evidence: Its own public description names part of unified communications companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name unified communications 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 3,432 unified communications companies worldwide

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Unified communications companies worldwide at a glance

As of Sep 22, 2026

29.5%Verified-email coverage

33.2Average contacts per company

11-50Median size (employees)

2.3%Largest-city concentration · London

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

1,328

11-50

1,405

51-200

438

201-500

135

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 communications 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.
Coverage: Every country. Country and city lists for unified communications companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “unified communications 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 unified communications 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 unified communications companies, and records with no verified work email.
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, 33,671 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.

Unified communications companies by location

13 lists · largest first

Every Unified communications companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 communications 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 unified communications companies are there worldwide?

RevenueBase identified 3,432 unified communications companies worldwide 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 country has the most unified communications companies?

The United States leads with 1,049 companies, followed by the United Kingdom (376) and Brazil (139). Every unified communications companies list by country and city is linked on this page.

Which city has the most unified communications companies?

London leads with 80 headquartered companies, followed by Sao Paulo (39) and New York (32).

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 33,671 verified decision-maker contacts tracked across these 3,432 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.