Company lists · Data refreshed September 2026

Top 25 Business phone system providers worldwide

Name: Business phone system providers worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 3,591 companies tracked

RevenueBase identified 3,591 business phone system providers worldwide as of September 2026 and tracks 37,808 professional contacts across them, including 11,102 with verified work emails. The United States is the largest market and London the largest hub.

This list covers business phone system providers 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 19, 2026. Country and city lists for business phone system providers 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 19, 2026 86% judged on-target in blind review

3,591Companies

37,808Contacts tracked

11,102Verified emails

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The 25 largest business phone system providers worldwide

Ranked by team size

Top 25 of 3,591 business phone system providers worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to business phone system providers: 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	GOTO	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,320 contacts →
	Indirect 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 19, 2026
2	GAMMA	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	1,001-5,000	1,568 contacts →
	Indirect evidence “Gamma Communications is a leading provider of technology-based communication solutions across Europe.” Source: RevenueBase Database · checked Sep 19, 2026
3	Onecom	Indirect evidence	Fareham, United KingdomHQ checked Sep 19, 2026	501-1,000	655 contacts →
	Indirect 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 19, 2026
4	Ooma, INC	Partial evidence	Sunnyvale, CA, United StatesHQ checked Sep 19, 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 19, 2026
5	Deepija Telecom PVT LTD	Indirect evidence	Hyderabad, IndiaHQ checked Sep 19, 2026	201-500	527 contacts →
	Indirect evidence “Telecom Applications are one of the fastest-changing technologies of today.” Source: RevenueBase Database · checked Sep 19, 2026
6	C3ntro Telecom	Indirect evidence	Miguel Hidalgo, MexicoHQ checked Sep 19, 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 19, 2026
7	Sangoma	Indirect evidence	Markham, ON, CanadaHQ checked Sep 19, 2026	201-500	454 contacts →
	Indirect evidence “Sangoma Technologies Corporation (TSX: STC; Nasdaq: SANG) is a global leader in essential business communications.” Source: RevenueBase Database · checked Sep 19, 2026
8	Stelogy	Indirect evidence	Paris, FranceHQ checked Sep 19, 2026	501-1,000	403 contacts →
	Indirect evidence “VoIP/ToIP services Operator and Integrator Telephony solutions for small and medium-sized enterprises.” Source: RevenueBase Database · checked Sep 19, 2026
9	Wildix	Indirect evidence	Tallinn, EstoniaHQ checked Sep 19, 2026	201-500	334 contacts →
	Indirect evidence “The First Sales-Oriented Unified Communications Solution, now powered by AI Wildix develops secure, AI-powered business communication solutions designed to support revenue growth…” Source: RevenueBase Database · checked Sep 19, 2026
10	KEYYO	Indirect evidence	Clichy, FranceHQ checked Sep 19, 2026	201-500	319 contacts →
	Indirect evidence “Keyyo développe de nouveaux usages de communication pour les entreprises, notamment avec la voix sur IP.” Source: RevenueBase Database · checked Sep 19, 2026
11	BCM ONE	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	501-1,000	308 contacts →
	Indirect evidence “Founded in 1992, BCM One is a corporate communications company that powers business connectivity for organizations ranging from SMBs to global enterprises.” Source: RevenueBase Database · checked Sep 19, 2026
12	Pulse Telesystems	Indirect evidence	Chennai, IndiaHQ checked Sep 19, 2026	51-200	175 contacts →
	Indirect evidence “Pulse Telesystems is a leading telecom solution provider in India, offering businesses personalized telecom solutions that meet their growing needs and beyond.” Source: RevenueBase Database · checked Sep 19, 2026
13	Firstcomm	Indirect evidence	Fairlawn, OH, United StatesHQ checked Sep 19, 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 19, 2026
14	Bonline	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	170 contacts →
	Indirect evidence “bOnline is UK’s leading provider of VoIP services for micro and small businesses.” Source: RevenueBase Database · checked Sep 19, 2026
15	Fortis	Indirect evidence	Sacramento, CA, United StatesHQ checked Sep 19, 2026	n/a	170 contacts →
	Indirect evidence “Fortis is a Sacramento Area provider of managed IT services, hosted VoIP, and high speed, redundant internet.” Source: RevenueBase Database · checked Sep 19, 2026
16	Voip Office	Indirect evidence	Bangalore, United StatesHQ checked Sep 19, 2026	201-500	167 contacts →
	Indirect evidence “VoIP Office, founded in 2004, delivers cloud-based communications and hosted PBX solutions for businesses from home offices to enterprises, combining traditional PBX features with…” Source: RevenueBase Database · checked Sep 19, 2026
17	Zultys	Strong evidence	Sunnyvale, CA, United StatesHQ checked Sep 19, 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 19, 2026
18	Unified Voice Communication PVT LTD	Indirect evidence	Chennai, IndiaHQ checked Sep 19, 2026	51-200	131 contacts →
	Indirect evidence “Unifiedvoice is a globally recognized VoIP service and solutions provider.” Source: RevenueBase Database · checked Sep 19, 2026
19	Transcom Telecommunications	Indirect evidence	Signal Hill, CA, United StatesHQ checked Sep 19, 2026	11-50	127 contacts →
	Indirect evidence “Transcom Telecommunications (formerly called "Transcom Services") is a Veteran Owned Business founded in 1986 on 3 core ideas.” Source: RevenueBase Database · checked Sep 19, 2026
20	Estech Systems, Inc. ESI	Strong evidence	Plano, TX, United StatesHQ checked Sep 19, 2026	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 Sep 19, 2026
21	KOL Telecom Services LLC	Partial evidence	Wilmington, DE, United StatesHQ checked Sep 19, 2026	11-50	112 contacts →
	Partial evidence “KOL Telecom is the leading innovator of small business Voice over IP (VoIP) Phone services.” Source: RevenueBase Database · checked Sep 19, 2026
22	Tela Technology	Indirect evidence	Hampton-in-arden, United KingdomHQ checked Sep 19, 2026	51-200	111 contacts →
	Indirect evidence “We provide communication solutions and IT business services to businesses, big and small, to help your business grow.” Source: RevenueBase Database · checked Sep 19, 2026
23	Telecloud	Indirect evidence	Morristown, NJ, United StatesHQ checked Sep 19, 2026	11-50	108 contacts →
	Indirect evidence “TeleCloud delivers modern Unified Communications, VoIP, and AI-powered communication solutions, paired with the personal, local service businesses deserve.” Source: RevenueBase Database · checked Sep 19, 2026
24	Gamma Comunicaciones	Indirect evidence	Cerdanyola Del Vallés, SpainHQ checked Sep 19, 2026	51-200	105 contacts →
	Indirect evidence “VozTelecom es la compañía especialista en comunicaciones cloud y líder en telefonía IP dentro del segmento de la pequeña y mediana empresa en España.” Source: RevenueBase Database · checked Sep 19, 2026
25	YO Telecom	Indirect evidence	Southampton, United KingdomHQ checked Sep 19, 2026	51-200	97 contacts →
	Indirect evidence “Yo Telecom is an award winning telecommunications provider that specialises in small to medium sized businesses.” Source: RevenueBase Database · checked Sep 19, 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: business phone system providers. 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 business phone system providers.
Partial evidence: Its own public description names part of business phone system providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name business phone system providers. 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 3,591 business phone system providers worldwide

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Business phone system providers worldwide at a glance

As of Sep 19, 2026

29.4%Verified-email coverage

10.5Average contacts per company

1-10Median size (employees)

2.4%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

1,828

11-50

1,390

51-200

278

201-500

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 business phone system providers, 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 business phone system providers are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “business phone system providers”. 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 business phone system providers), 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 business phone system providers, 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, 11,102 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 19, 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.

Business phone system providers by location

13 lists · largest first

Every Business phone system providers 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 business phone system providers, 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 business phone system providers are there worldwide?

RevenueBase identified 3,591 business phone system providers 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?

GOTO, headquartered in Boston, tops this list with the largest team on record.

Which country has the most business phone system providers?

The United States leads with 1,075 companies, followed by the United Kingdom (586) and Canada (173). Every business phone system providers list by country and city is linked on this page.

Which city has the most business phone system providers?

London leads with 87 headquartered companies, followed by Sao Paulo (35) and New York (26).

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 11,102 verified decision-maker contacts tracked across these 3,591 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 19, 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.