Company lists · Data refreshed November 2026

Top 25 Business telephone system installers worldwide

RevenueBase identified 2,888 company matches for business telephone system installers worldwide as of November 2026 and tracks 30,302 professional contacts across them, including 3,860 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for business telephone system installers worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 6, 2026. Country and city lists for business telephone system installers follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Nov 6, 2026 How this list was built
2,888Companies
30,302Contacts tracked
3,860Verified emails
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The 25 largest business telephone system installers worldwide

Ranked by team size
Top 25 of 2,888 company matches for business telephone system installers worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchRio De Janeiro, BrazilHQ recorded Nov 6, 202610001+8,708 contacts →

Exact match

“A Serede é uma empresa prestadora de serviços de implantação e manutenção em redes de Telecom, fundada em 06 de agosto de 2007.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2Exact matchJaboticabal, BrazilHQ recorded Nov 6, 20261,001-5,000551 contacts →

Exact match

“B.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3Exact matchFranceHQ recorded Nov 6, 202651-200506 contacts →

Exact match

“Telecommunication Installation and Maintenance”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4Exact matchUnited StatesHQ recorded Nov 6, 20261,001-5,000449 contacts →

Exact match

“A national telecommunications customer service fulfillment company, Prince Telecom specializes in Residential & Commercial installations, repair and construction services for…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5Exact matchDerby, United KingdomHQ recorded Nov 6, 2026501-1,000421 contacts →

Exact match

“Comex is an established major strategic partner of choice within the telecommunication sector, across the United Kingdom and Ireland, offering an end to end solution.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6Exact matchUmraniye, TürkiyeHQ recorded Nov 6, 202651-200388 contacts →

Exact match

“Gentel Telecommunication was founded in 2006, for developing work areas and work opinions in telecommunication industry with its strong background and experience over 30 years.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7Exact matchLake Mary, FL, United StatesHQ recorded Nov 6, 2026n/a373 contacts →

Exact match

“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…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8Exact matchPlano, TX, United StatesHQ recorded Nov 6, 202651-200176 contacts →

Exact match

“Edge is an innovative provider of communications, data, systems security and business technology services.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9Exact matchMakati City, PhilippinesHQ recorded Nov 6, 202651-200130 contacts →

Exact match

“About TRICOM Dynamics, Inc.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10Exact matchMadrid, SpainHQ recorded Nov 6, 202651-200104 contacts →

Exact match

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

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11Exact matchUnited StatesHQ recorded Nov 6, 20261,001-5,000102 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12Exact matchChesterfield, MO, United StatesHQ recorded Nov 6, 202651-200100 contacts →

Exact match

“Since its founding in 1985, CMS Communications has been a leader in providing Telecom equipment and services.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13Exact matchMadrid, SpainHQ recorded Nov 6, 202651-20099 contacts →

Exact match

“Coyser S.A.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14Exact matchMcmurray, PA, United StatesHQ recorded Nov 6, 2026201-50090 contacts →

Exact match

“The Baker Mission At Baker Installations, we strive to build consumer confidence every day.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15Exact matchSan Giovanni Teatino, ItalyHQ recorded Nov 6, 202651-20089 contacts →

Exact match

“Autelcom svolge attività di progettazione, fornitura, installazione, manutenzione, presidio e outsourcing di prodotti ad elevato contenuto tecnologico.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16Exact matchArvada, CO, United StatesHQ recorded Nov 6, 202611-5086 contacts →

Exact match

“We make workplace technology work for you.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17Exact matchChattanooga, TN, United StatesHQ recorded Nov 6, 202611-5081 contacts →

Exact match

“For over 30 years, CRI has installed, maintained and serviced business communications systems throughout the Southeastern U.S.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18Exact matchHouston, TX, United StatesHQ recorded Nov 6, 202611-5078 contacts →

Exact match

“At ATSI, we believe technology should empower people.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19Exact matchUnited StatesHQ recorded Nov 6, 2026201-50071 contacts →

Exact match

“In June of 2015, Onepath Systems, LLC merged with Endeavor Telecom and acquired BlueWave Computing.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20Exact matchPittsburgh, PA, United StatesHQ recorded Nov 6, 202651-20068 contacts →

Exact match

“Founded in 1973, Pittsburgh-based Dagostino Electronic Services, Inc.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21Exact matchNuth, NetherlandsHQ recorded Nov 6, 202611-5067 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22Exact matchDoylestown, PA, United StatesHQ recorded Nov 6, 2026n/a67 contacts →

Exact match

“Itsalldata is first and foremost a business communications consulting firm.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23Exact matchDallas, TX, United StatesHQ recorded Nov 6, 202611-5066 contacts →

Exact match

“Business Class Phone Systems & Service with support & functionality to exceed your communication needs.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24Exact matchAmsterdam, NetherlandsHQ recorded Nov 6, 202651-20065 contacts →

Exact match

“Telesol Group is a trusted and ISO 9001:2015 and ISO 27001:2013 certified IT network support partner offering a range of telecommunication services worldwide.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25Exact matchPittsburgh, PA, United StatesHQ recorded Nov 6, 202651-20064 contacts →

Exact match

“Full Service Network is a privately held Telecommunications Services Carrier based in Pittsburgh, Pennsylvania.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

Showing 25 of 2,888 business telephone system installers worldwide

See the full list, filter by size, metro and specialty, and access 3,860 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Business telephone system installers worldwide at a glance

As of Nov 6, 2026
12.7%Verified-email coverage
10.5Average contacts per company
1-10Median size (employees)
0.8%Largest-city concentration · London
Nov 6, 2026Page data refreshed

Companies by employee count

1-10
1,584
11-50
1,031
51-200
169
201-500
23
501-1,000
7
1,001-5,000
9
5,001-10,000
1
10001+
2

Email recency is reported on each country list linked below.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
Coverage
Every country. Country and city lists for business telephone system installers are linked below.
What qualifies
Company records worldwide whose business descriptions match “business telephone system installers” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 3,860 professional contacts with verified work emails across the full matched dataset. 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 November 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Business telephone system installers by location

10 lists · largest first

Every Business telephone system installers 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 SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “business telephone system installers”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many business telephone system installers are there worldwide?

RevenueBase identified 2,888 company matches for business telephone system installers worldwide as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Serede tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most business telephone system installers?

The United States leads with 926 companies, followed by the United Kingdom (259) and Italy (176). Every business telephone system installers list by country and city is linked on this page.

Which city has the most business telephone system installers?

London leads with 23 company records, followed by Sao Paulo (20) and Houston (16).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 3,860 professional contacts with verified work emails tracked across these 2,888 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 6, 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 SmartSearch, 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.