Company lists · Data refreshed September 2026

Top 25 Enterprise telephony consultants worldwide

RevenueBase identified 3,616 enterprise telephony consultants worldwide as of September 2026 and tracks 33,195 professional contacts across them, including 6,847 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers enterprise telephony consultants 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 28, 2026. Country and city lists for enterprise telephony consultants 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 28, 2026 86% judged on-target in blind review
3,616Companies
33,195Contacts tracked
6,847Verified emails
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The 25 largest enterprise telephony consultants worldwide

Ranked by team size
Top 25 of 3,616 enterprise telephony consultants worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to enterprise telephony consultants: 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
1Partial evidenceNew Delhi, IndiaHQ checked Sep 28, 20261,001-5,0001,481 contacts →

Partial evidence

“Tulip Telecom Ltd.(BSE: 532691/NSE: TULIP) is India’s leading Enterprise Communications Service provider.”

Source: RevenueBase Database · checked Sep 28, 2026
2Indirect evidenceBangalore, IndiaHQ checked Sep 28, 2026201-500666 contacts →

Indirect evidence

“We @ VIS Networks (Voice Infrastructure Services) believe in the future of technology services.”

Source: RevenueBase Database · checked Sep 28, 2026
3Strong evidenceParis, FranceHQ checked Sep 28, 2026501-1,000403 contacts →

Strong evidence

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

Source: RevenueBase Database · checked Sep 28, 2026
4Partial evidenceTacoma, WA, United StatesHQ checked Sep 28, 2026201-500366 contacts →

Partial evidence

“With three decades of expertise in the enterprise communications space, Continuant stands out as a seasoned Managed Services Provider, Systems Integrator, and Technology…”

Source: RevenueBase Database · checked Sep 28, 2026
5Indirect evidenceBratislava, SlovakiaHQ checked Sep 28, 2026501-1,000363 contacts →

Indirect evidence

“One of the leading systems integrators in the European market today.”

Source: RevenueBase Database · checked Sep 28, 2026
6Partial evidenceLake Mary, FL, United StatesHQ checked Sep 28, 2026n/a358 contacts →

Partial evidence

“ACS has over three decades of experience and unparalleled expertise in the assessment and implementation of voice and data platforms and can provide solutions for telephone…”

Source: RevenueBase Database · checked Sep 28, 2026
7Indirect evidenceClichy, FranceHQ checked Sep 28, 2026201-500319 contacts →

Indirect evidence

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

Source: RevenueBase Database · checked Sep 28, 2026
8Indirect evidencePune, IndiaHQ checked Sep 28, 2026201-500298 contacts →

Indirect evidence

“Syntel is the Telecom Division of Arvind Limited, a flagship company of the INR 50 billion Lalbhai Group.”

Source: RevenueBase Database · checked Sep 28, 2026
9Indirect evidenceOsasco, BrazilHQ checked Sep 28, 2026201-500273 contacts →

Indirect evidence

“A Handphone Telecomunicações é uma indústria, fabricante de equipamentos para Telecomunicações, tais como sistemas PABX de pequeno, médio e grande porte, sistemas Call Center's…”

Source: RevenueBase Database · checked Sep 28, 2026
10Indirect evidenceEagan, MN, United StatesHQ checked Sep 28, 2026501-1,000252 contacts →

Indirect evidence

“As the leading global integrator of business communication solutions and services since 1993, NACR has been a trusted advisor to more than 40% of the Fortune 100 companies…”

Source: RevenueBase Database · checked Sep 28, 2026
11Partial evidenceFlorianópolis, BrazilHQ checked Sep 28, 2026201-500207 contacts →

Partial evidence

“Khomp is a Brazilian company, based in Santa Catarina, which provides leading edge technology for the development of convergence solutions between computer and telephony, in the…”

Source: RevenueBase Database · checked Sep 28, 2026
12Indirect evidencePort Washington, NY, United StatesHQ checked Sep 28, 202651-200198 contacts →

Indirect evidence

“Advantage mitigates the complexity of navigating a constantly evolving IT landscape.”

Source: RevenueBase Database · checked Sep 28, 2026
13Indirect evidenceEdgewood, NY, United StatesHQ checked Sep 28, 202651-200184 contacts →

Indirect evidence

“Established in 1988, Forerunner Technologies, Inc.”

Source: RevenueBase Database · checked Sep 28, 2026
14Indirect evidenceSlidell, LA, United StatesHQ checked Sep 28, 202651-200151 contacts →

Indirect evidence

“In-Telecom offers a full spectrum of solutions such as VoIP phones, access control, unparalleled customer service, IT consulting, and quality workmanship from our experienced…”

Source: RevenueBase Database · checked Sep 28, 2026
15Indirect evidenceCincinnati, OH, United StatesHQ checked Sep 28, 202611-50138 contacts →

Indirect evidence

“MTCI serves businesses in defining, developing and executing more efficient, functional and cost-effective telecommunications programs.”

Source: RevenueBase Database · checked Sep 28, 2026
16Indirect evidenceMinneapolis, MN, United StatesHQ checked Sep 28, 202651-200133 contacts →

Indirect evidence

“Unimax believes that administering PBX and voice messaging systems can be far less complex and costly, while delivering better service levels.”

Source: RevenueBase Database · checked Sep 28, 2026
17Indirect evidenceChennai, IndiaHQ checked Sep 28, 202651-200131 contacts →

Indirect evidence

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

Source: RevenueBase Database · checked Sep 28, 2026
18Indirect evidenceMexicoHQ checked Sep 28, 2026201-500131 contacts →

Indirect evidence

“Más de 35 años de experiencia integrando servicios de telecomunicaciones, enfocándonos en proveer soluciones de Comunicaciones Unificadas, Wireless, Seguridad Informática y…”

Source: RevenueBase Database · checked Sep 28, 2026
19Indirect evidenceFullerton, CA, United StatesHQ checked Sep 28, 2026201-500123 contacts →

Indirect evidence

“Altura Communication Solutions, with offices nationwide, is one of Avaya's largest Diamond Business Partners and a leading provider of communication-enabled solutions and…”

Source: RevenueBase Database · checked Sep 28, 2026
20Indirect evidenceMelbourne, AustraliaHQ checked Sep 28, 202651-200113 contacts →

Indirect evidence

“Your Trusted Partner in Digital Transformation and Communications Technology 30 Years of Innovation And Expertise GQI has been a trusted advisor and professional services provider…”

Source: RevenueBase Database · checked Sep 28, 2026
21Indirect evidenceGuadalajara, MexicoHQ checked Sep 28, 202611-50104 contacts →

Indirect evidence

“Nos enfocamos en el diseño e implementación de sus soluciones en telecomunicaciones, así como el soporte de las mismas; participamos de manera activa en la cadena de valor del…”

Source: RevenueBase Database · checked Sep 28, 2026
22Indirect evidencePerpignan, FranceHQ checked Sep 28, 202651-20097 contacts →

Indirect evidence

“Onedirect aide les entreprises à optimiser leurs communications professionnelles depuis plus de 25 ans.”

Source: RevenueBase Database · checked Sep 28, 2026
23Partial evidenceSindelfingen, GermanyHQ checked Sep 28, 202651-20096 contacts →

Partial evidence

“innovaphone has been playing a decisive role in driving the development of IP telephony and digital transformation for more than 25 years now and is a leading European provider of…”

Source: RevenueBase Database · checked Sep 28, 2026
24Indirect evidenceMadrid, SpainHQ checked Sep 28, 202651-20093 contacts →

Indirect evidence

“mdtel is a manufacturer and integrator of corporate telecommunications solutions for business environments with more than 20 years of experience.”

Source: RevenueBase Database · checked Sep 28, 2026
25Strong evidenceLahore, PakistanHQ checked Sep 28, 202651-20092 contacts →

Strong evidence

“Contegris provides Consultancy, System Integration and Innovative Communication Technology Solutions focusing on the enterprise market.”

Source: RevenueBase Database · checked Sep 28, 2026

Showing 25 of 3,616 enterprise telephony consultants worldwide

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Enterprise telephony consultants worldwide at a glance

As of Sep 28, 2026
20.6%Verified-email coverage
9.2Average contacts per company
1-10Median size (employees)
2.2%Largest-city concentration · Sao Paulo
Sep 28, 2026Page data refreshed

Companies by employee count

1-10
2,067
11-50
1,261
51-200
214
201-500
41
501-1,000
8
1,001-5,000
8
5,001-10,000
2
10001+
3

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 enterprise telephony consultants, 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 enterprise telephony consultants are linked below.
What qualifies
Companies worldwide whose own description of what they do matches “enterprise telephony consultants”. 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 enterprise telephony consultants), 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 enterprise telephony consultants, 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, 6,847 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 28, 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.

Enterprise telephony consultants by location

20 lists · largest first

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

Countries

Cities

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 enterprise telephony consultants, 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 enterprise telephony consultants are there worldwide?

RevenueBase identified 3,616 enterprise telephony consultants 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?

Tulip Telecom, headquartered in New Delhi, tops this list with the largest team on record.

Which country has the most enterprise telephony consultants?

The United States leads with 901 companies, followed by Brazil (318) and the United Kingdom (198). Every enterprise telephony consultants list by country and city is linked on this page.

Which city has the most enterprise telephony consultants?

Sao Paulo leads with 79 headquartered companies, followed by London (37) and New York (30).

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 6,847 verified decision-maker contacts tracked across these 3,616 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 28, 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.