Company lists · Data refreshed September 2026

Top 25 Ip telephony companies worldwide

RevenueBase identified 2,687 ip telephony companies worldwide as of September 2026 and tracks 31,757 professional contacts across them, including 9,704 with verified work emails and 0 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers ip telephony 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 15, 2026. Country and city lists for ip telephony 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 15, 2026 86% judged on-target in blind review
2,687Companies
31,757Contacts tracked
9,704Verified emails
0Mobile numbers
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The 25 largest ip telephony companies worldwide

Ranked by team size
Top 25 of 2,687 ip telephony companies worldwide, ranked by team size, largest first. Data refreshed Sep 15, 2026. RevenueBase Smart Search rates how each company's information relates to ip telephony 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceBoston, MA, United StatesHQ checked Sep 15, 20261,001-5,0002,320 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 15, 2026
2Indirect evidenceSunnyvale, CA, United StatesHQ checked Sep 15, 20261,001-5,0001,254 contacts →

Indirect 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 15, 2026
3Indirect evidenceSunnyvale, CA, United StatesHQ checked Sep 15, 2026501-1,000606 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 15, 2026
4Indirect evidenceHyderabad, IndiaHQ checked Sep 15, 2026201-500527 contacts →

Indirect evidence

“Telecom Applications are one of the fastest-changing technologies of today.”

Source: RevenueBase Database · checked Sep 15, 2026
5Indirect evidenceMarkham, ON, CanadaHQ checked Sep 15, 2026201-500454 contacts →

Indirect evidence

“Sangoma Technologies Corporation (TSX: STC; Nasdaq: SANG) is a global leader in essential business communications.”

Source: RevenueBase Database · checked Sep 15, 2026
6Indirect evidencePlano, TX, United StatesHQ checked Sep 15, 2026201-500435 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 15, 2026
7Partial evidenceParis, FranceHQ checked Sep 15, 2026501-1,000403 contacts →

Partial evidence

“VoIP/ToIP services Operator and Integrator Telephony solutions for small and medium-sized enterprises.”

Source: RevenueBase Database · checked Sep 15, 2026
8Indirect evidenceNew York, NY, United StatesHQ checked Sep 15, 2026201-500398 contacts →

Indirect 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 15, 2026
9Partial evidenceClichy, FranceHQ checked Sep 15, 2026201-500319 contacts →

Partial evidence

“Keyyo développe de nouveaux usages de communication pour les entreprises, notamment avec la voix sur IP.”

Source: RevenueBase Database · checked Sep 15, 2026
10Indirect evidenceEdgewood, NY, United StatesHQ checked Sep 15, 202651-200184 contacts →

Indirect evidence

“Established in 1988, Forerunner Technologies, Inc.”

Source: RevenueBase Database · checked Sep 15, 2026
11Indirect evidenceAlmere, NetherlandsHQ checked Sep 15, 20261,001-5,000178 contacts →

Indirect evidence

“A unified communications company, helping customers work wonders, for their workplaces, their teams and their business.”

Source: RevenueBase Database · checked Sep 15, 2026
12Indirect evidenceChennai, IndiaHQ checked Sep 15, 202651-200175 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 15, 2026
13Indirect evidenceFairlawn, OH, United StatesHQ checked Sep 15, 202651-200174 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 15, 2026
14Indirect evidenceLondon, United KingdomHQ checked Sep 15, 202651-200170 contacts →

Indirect evidence

“bOnline is UK’s leading provider of VoIP services for micro and small businesses.”

Source: RevenueBase Database · checked Sep 15, 2026
15Indirect evidenceSacramento, CA, United StatesHQ checked Sep 15, 2026n/a170 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 15, 2026
16Indirect evidenceBangalore, United StatesHQ checked Sep 15, 2026201-500167 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 15, 2026
17Indirect evidenceNew Delhi -, IndiaHQ checked Sep 15, 202651-200161 contacts →

Indirect evidence

“World Phone Internet Services Private Limited has ushered in a new era in communications for India.”

Source: RevenueBase Database · checked Sep 15, 2026
18Indirect evidenceZaventem, BelgiumHQ checked Sep 15, 2026501-1,000159 contacts →

Indirect evidence

“Destiny, originally Belgian, is a European leader and innovator in secure cloud communications based on its strong and secure mobile-first products and Ucaas offerings.”

Source: RevenueBase Database · checked Sep 15, 2026
19Indirect evidenceSunnyvale, CA, United StatesHQ checked Sep 15, 202651-200159 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 15, 2026
20Indirect evidenceBirmingham, AL, United StatesHQ checked Sep 15, 202651-200154 contacts →

Indirect evidence

“IT Voice specializes in Managed IT and VoIP solutions.”

Source: RevenueBase Database · checked Sep 15, 2026
21Indirect evidenceClichy, FranceHQ checked Sep 15, 2026501-1,000150 contacts →

Indirect evidence

“Bienvenue dans le monde des communications d’entreprises nouvelles générations : connectées, intelligentes, flexibles et sécurisées.”

Source: RevenueBase Database · checked Sep 15, 2026
22Indirect evidenceChennai, IndiaHQ checked Sep 15, 202651-200131 contacts →

Indirect evidence

“Unifiedvoice is a globally recognized VoIP service and solutions provider.”

Source: RevenueBase Database · checked Sep 15, 2026
23Indirect evidenceSignal Hill, CA, United StatesHQ checked Sep 15, 202611-50127 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 15, 2026
24Indirect evidenceSan Jose, CA, United StatesHQ checked Sep 15, 202651-200126 contacts →

Indirect 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 15, 2026
25Indirect evidencePlano, TX, United StatesHQ checked Sep 15, 202651-200121 contacts →

Indirect evidence

“Founded in 1987, Estech Systems (ESI), a Crexendo® company, delivers high-performance phone systems designed for growing businesses.”

Source: RevenueBase Database · checked Sep 15, 2026

Showing 25 of 2,687 ip telephony companies worldwide

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Ip telephony companies worldwide at a glance

As of Sep 15, 2026
30.6%Verified-email coverage
11.8Average contacts per company
11-50Median size (employees)
3.6%Largest-city concentration · London
Sep 15, 2026Page data refreshed

Companies by employee count

1-10
1,259
11-50
1,094
51-200
254
201-500
45
501-1,000
11
1,001-5,000
9
5,001-10,000
2
10001+
1

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 ip telephony 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
14 countries, largest first: the United States, the United Kingdom, Brazil, Canada, Australia, the Netherlands, India, Spain, France, South Africa and 4 more. Country and city lists for ip telephony companies are linked below.
What qualifies
Companies worldwide whose own description of what they do matches “ip telephony 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 ip telephony 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 ip telephony 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, 9,704 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 15, 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.

Ip telephony companies by location

14 lists · largest first

Every Ip telephony 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 ip telephony 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 ip telephony companies are there worldwide?

RevenueBase identified 2,687 ip telephony 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?

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

Which country has the most ip telephony companies?

The United States leads with 1,187 companies, followed by the United Kingdom (405) and Brazil (194). Every ip telephony companies list by country and city is linked on this page.

Which city has the most ip telephony companies?

London leads with 96 headquartered companies, followed by Sao Paulo (55) and New York (50).

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 9,704 verified decision-maker contacts tracked across these 2,687 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 15, 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.