Company lists · Data refreshed November 2026
Top 25 Office phone system providers worldwide
RevenueBase identified 2,910 company matches for office phone system providers worldwide as of November 2026 and tracks 21,607 professional contacts across them, including 4,968 with verified work emails. The United States is the largest market and London the largest hub.
This list covers company matches for office phone system providers 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 office phone system providers 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.
The 25 largest office phone system providers worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 373 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 | |||||
| 2 | 327 contacts → | ||||
Exact match “Keyyo développe de nouveaux usages de communication pour les entreprises, notamment avec la voix sur IP.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 3 | 170 contacts → | ||||
Exact match “Zultys is a premier provider of omnichannel, Unified Communications, hosted business phone services and premise-based communications systems.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 4 | 144 contacts → | ||||
Exact match “Unifiedvoice is a globally recognized VoIP service and solutions provider.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 5 | 143 contacts → | ||||
Exact match “Transcom Telecommunications (formerly called "Transcom Services") is a Veteran Owned Business founded in 1986 on 3 core ideas.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 6 | 125 contacts → | ||||
Exact match “Founded in 1987, Estech Systems (ESI), a Crexendo® company, delivers high-performance phone systems designed for growing businesses.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 7 | 112 contacts → | ||||
Exact match “We Solve Problems and Create Solutions with VoIP.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 8 | 112 contacts → | ||||
Exact match “KOL Telecom is the leading innovator of small business Voice over IP (VoIP) Phone services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 9 | 106 contacts → | ||||
Exact match “Made for businesses of all sizes, Bicom Systems revolutionizes communications by providing PBXware, the world's most unified turnkey open standards hosted telephony platform, plus…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 10 | 104 contacts → | ||||
Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 11 | 100 contacts → | ||||
Exact match “Sarenet es el proveedor de voz y datos con más experiencia de cuantos hoy operan en España.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 12 | 100 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 | |||||
| 13 | 99 contacts → | ||||
Exact match “Coyser S.A.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 14 | 86 contacts → | ||||
Exact match “Powering Your Companies Voice & More Utilizing the latest technologies in voice such as VoIP (Voice-Over-Internet-Protocol) and other networking technologies, we can provide your…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 15 | 86 contacts → | ||||
Exact match “We make workplace technology work for you.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 16 | 84 contacts → | ||||
Exact match “UniTalk - єдине рішення для керування спілкуванням з клієнтами.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 17 | 81 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 | |||||
| 18 | 81 contacts → | ||||
Exact match “Contact an expert now: 0800 9 77 88 99 Specialists in providing businesses with telecoms, data and energy since 1989.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 19 | 80 contacts → | ||||
Exact match “NetCarrier Telecom, Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 20 | 79 contacts → | ||||
Exact match “Full Service Telecommunications Provider.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 21 | 78 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 | |||||
| 22 | 75 contacts → | ||||
Exact match “TeleComp is a full-service technology company offering Enterprise VoIP phone systems, Fiber Bandwidth, Cybersecurity/Compliance and Managed Services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 23 | 71 contacts → | ||||
Exact match “VoipVoice è il primo Provider Italiano VoIP totalmente Business-Oriented.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 24 | 70 contacts → | ||||
Exact match “Telappliant is an award-winning VoIP and cloud communications provider.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 25 | 68 contacts → | ||||
Exact match “Headquartered in New York City, InterGlobe Communications is a one stop network service provider.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “office phone system providers”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 2,910 office phone system providers worldwide
See the full list, filter by size, metro and specialty, and access 4,968 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Office phone system providers worldwide at a glance
As of Nov 6, 2026Companies by employee count
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 office phone system providers are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “office phone system providers” 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 4,968 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.
Office phone system providers by location
12 lists · largest firstEvery Office phone system providers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Office phone system providers based in the United States1,122
- Office phone system providers based in the United Kingdom333
- Office phone system providers based in Canada130
- Office phone system providers based in Germany91
- Office phone system providers based in Brazil89
- Office phone system providers based in Australia88
- Office phone system providers based in France72
- Office phone system providers based in Italy59
- Office phone system providers based in the Netherlands59
- Office phone system providers based in Spain56
Cities
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 “office phone system providers”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many office phone system providers are there worldwide?
RevenueBase identified 2,910 company matches for office phone system providers 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?
ACS tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most office phone system providers?
The United States leads with 1,122 companies, followed by the United Kingdom (333) and Canada (130). Every office phone system providers list by country and city is linked on this page.
Which city has the most office phone system providers?
London leads with 44 company records, followed by New York (26) and Houston (24).
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 4,968 professional contacts with verified work emails tracked across these 2,910 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.
Ready to reach these companies? Verified emails and direct dials for all 2,910 office phone system providers worldwide. Start with a free account, no credit card.
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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.
More company lists
Company intelligence · public preview
Top 25 office phone system providers worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 2,910 matching company records for office phone system providers worldwide, with 21,607 tracked contacts and 4,968 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: November 6, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 office phone system providers worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  ACS2acs.comHQ: Lake Mary, FL, United StatesReported employees: Not recorded | Lake Mary, FL, United States | Not recorded | Exact match | 373 contacts → |
“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 description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  KEYYOkeyyo.comHQ: Clichy, FranceReported employees: 201-500 | Clichy, France | 201-500 | Exact match | 327 contacts → |
“Keyyo développe de nouveaux usages de communication pour les entreprises, notamment avec la voix sur IP.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Zultyszultys.comHQ: Sunnyvale, CA, United StatesReported employees: 51-200 | Sunnyvale, CA, United States | 51-200 | Exact match | 170 contacts → |
“Zultys is a premier provider of omnichannel, Unified Communications, hosted business phone services and premise-based communications systems.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Unified Voice Communication PVT LTDunifiedvoice.inHQ: Chennai, IndiaReported employees: 51-200 | Chennai, India | 51-200 | Exact match | 144 contacts → |
“Unifiedvoice is a globally recognized VoIP service and solutions provider.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Transcom Telecommunicationstranscomla.comHQ: Signal Hill, CA, United StatesReported employees: 11-50 | Signal Hill, CA, United States | 11-50 | Exact match | 143 contacts → |
“Transcom Telecommunications (formerly called "Transcom Services") is a Veteran Owned Business founded in 1986 on 3 core ideas.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Estech Systems, Inc. ESIesi-estech.comHQ: Plano, TX, United StatesReported employees: 51-200 | Plano, TX, United States | 51-200 | Exact match | 125 contacts → |
“Founded in 1987, Estech Systems (ESI), a Crexendo® company, delivers high-performance phone systems designed for growing businesses.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Voip Supplyvoipsupply.comHQ: Amherst, NY, United StatesReported employees: 11-50 | Amherst, NY, United States | 11-50 | Exact match | 112 contacts → |
“We Solve Problems and Create Solutions with VoIP.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  KOL Telecom Services LLCkoltelecom.comHQ: Wilmington, United StatesReported employees: 11-50 | Wilmington, United States | 11-50 | Exact match | 112 contacts → |
“KOL Telecom is the leading innovator of small business Voice over IP (VoIP) Phone services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Bicom Systemsbicomsystems.comHQ: London, United StatesReported employees: 51-200 | London, United States | 51-200 | Exact match | 106 contacts → |
“Made for businesses of all sizes, Bicom Systems revolutionizes communications by providing PBXware, the world's most unified turnkey open standards hosted telephony platform, plus…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Innovaphoneinnovaphone.comHQ: Sindelfingen, GermanyReported employees: 51-200 | Sindelfingen, Germany | 51-200 | Exact match | 104 contacts → |
“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…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Sarenetsarenet.esHQ: Zamudio, SpainReported employees: 51-200 | Zamudio, Spain | 51-200 | Exact match | 100 contacts → |
“Sarenet es el proveedor de voz y datos con más experiencia de cuantos hoy operan en España.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  CMS Communicationscmsc.comHQ: Chesterfield, MO, United StatesReported employees: 51-200 | Chesterfield, MO, United States | 51-200 | Exact match | 100 contacts → |
“Since its founding in 1985, CMS Communications has been a leader in providing Telecom equipment and services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Coyser SAcoyser.comHQ: Madrid, SpainReported employees: 51-200 | Madrid, Spain | 51-200 | Exact match | 99 contacts → |
“Coyser S.A.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Voip Networksvoipnetworks.comHQ: Cherry Hill, NY, United StatesReported employees: 51-200 | Cherry Hill, NY, United States | 51-200 | Exact match | 86 contacts → |
“Powering Your Companies Voice & More Utilizing the latest technologies in voice such as VoIP (Voice-Over-Internet-Protocol) and other networking technologies, we can provide your…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | HQ: Arvada, CO, United StatesReported employees: 11-50 | Arvada, CO, United States | 11-50 | Exact match | 86 contacts → |
“We make workplace technology work for you.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Unitalkunitalk.cloudHQ: Kyiv, UkraineReported employees: 11-50 | Kyiv, Ukraine | 11-50 | Exact match | 84 contacts → |
“UniTalk - єдине рішення для керування спілкуванням з клієнтами.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  CRIgocri.comHQ: Chattanooga, TN, United StatesReported employees: 11-50 | Chattanooga, TN, United States | 11-50 | Exact match | 81 contacts → |
“For over 30 years, CRI has installed, maintained and serviced business communications systems throughout the Southeastern U.S.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  ICS Communicationsicscomms.co.ukHQ: Camberley, United KingdomReported employees: 11-50 | Camberley, United Kingdom | 11-50 | Exact match | 81 contacts → |
“Contact an expert now: 0800 9 77 88 99 Specialists in providing businesses with telecoms, data and energy since 1989.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Netcarriernetcarrier.comHQ: Audubon, PA, United StatesReported employees: 51-200 | Audubon, PA, United States | 51-200 | Exact match | 80 contacts → |
“NetCarrier Telecom, Inc.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  PC Telcompctelcom.coopHQ: Holyoke, CO, United StatesReported employees: 11-50 | Holyoke, CO, United States | 11-50 | Exact match | 79 contacts → |
“Full Service Telecommunications Provider.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Atsi Business Communications Systemsatsihou.comHQ: Houston, TX, United StatesReported employees: 11-50 | Houston, TX, United States | 11-50 | Exact match | 78 contacts → |
“At ATSI, we believe technology should empower people.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Telecomptelecomp.comHQ: Rogers, AR, United StatesReported employees: 51-200 | Rogers, AR, United States | 51-200 | Exact match | 75 contacts → |
“TeleComp is a full-service technology company offering Enterprise VoIP phone systems, Fiber Bandwidth, Cybersecurity/Compliance and Managed Services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Voipvoicevoipvoice.itHQ: Montelupo Fiorentino, ItalyReported employees: 11-50 | Montelupo Fiorentino, Italy | 11-50 | Exact match | 71 contacts → |
“VoipVoice è il primo Provider Italiano VoIP totalmente Business-Oriented.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Telapplianttelappliant.comHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 70 contacts → |
“Telappliant is an award-winning VoIP and cloud communications provider.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Interglobe Communicationsnyigc.comHQ: Staten Island, United StatesReported employees: 51-200 | Staten Island, United States | 51-200 | Exact match | 68 contacts → |
“Headquartered in New York City, InterGlobe Communications is a one stop network service provider.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 2,910 company matches
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Office phone system providers: dataset insights
November 6, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
2,874 records in the displayed employee bands.
36 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 2,910 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: November 6, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Office phone system providers by location
12 lists · largest firstEvery Office phone system providers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Office phone system providers based in the United States1,122
- Office phone system providers based in the United Kingdom333
- Office phone system providers based in Canada130
- Office phone system providers based in Germany91
- Office phone system providers based in Brazil89
- Office phone system providers based in Australia88
- Office phone system providers based in France72
- Office phone system providers based in Italy59
- Office phone system providers based in the Netherlands59
- Office phone system providers based in Spain56
Cities
Questions about this company list
What does Exact match mean for office phone system providers?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many office phone system providers did RevenueBase find worldwide?
The saved snapshot records 2,910 matching company records, 21,607 tracked contacts and 4,968 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: November 6, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
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Cite this list
RevenueBase Data Team. Top 25 office phone system providers worldwide. Snapshot: November 6, 2026. https://revenuebase.ai/companies/browse/office-phone-system-providers.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
Company intelligence · public preview
Top 25 office phone system providers worldwide
RevenueBase records 2,910 matching company records for office phone system providers worldwide, with 21,607 tracked contacts and 4,968 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: November 6, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 office phone system providers worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | ACS2acs.com HQ: Lake Mary, FL, United StatesReported employees: Not recorded | Lake Mary, FL, United States | Not recorded | Exact match | 373 contacts → |
“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 description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | KEYYOkeyyo.com HQ: Clichy, FranceReported employees: 201-500 | Clichy, France | 201-500 | Exact match | 327 contacts → |
“Keyyo développe de nouveaux usages de communication pour les entreprises, notamment avec la voix sur IP.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Zultyszultys.com HQ: Sunnyvale, CA, United StatesReported employees: 51-200 | Sunnyvale, CA, United States | 51-200 | Exact match | 170 contacts → |
“Zultys is a premier provider of omnichannel, Unified Communications, hosted business phone services and premise-based communications systems.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Unified Voice Communication PVT LTDunifiedvoice.in HQ: Chennai, IndiaReported employees: 51-200 | Chennai, India | 51-200 | Exact match | 144 contacts → |
“Unifiedvoice is a globally recognized VoIP service and solutions provider.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Transcom Telecommunicationstranscomla.com HQ: Signal Hill, CA, United StatesReported employees: 11-50 | Signal Hill, CA, United States | 11-50 | Exact match | 143 contacts → |
“Transcom Telecommunications (formerly called "Transcom Services") is a Veteran Owned Business founded in 1986 on 3 core ideas.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Estech Systems, Inc. ESIesi-estech.com HQ: Plano, TX, United StatesReported employees: 51-200 | Plano, TX, United States | 51-200 | Exact match | 125 contacts → |
“Founded in 1987, Estech Systems (ESI), a Crexendo® company, delivers high-performance phone systems designed for growing businesses.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Voip Supplyvoipsupply.com HQ: Amherst, NY, United StatesReported employees: 11-50 | Amherst, NY, United States | 11-50 | Exact match | 112 contacts → |
“We Solve Problems and Create Solutions with VoIP.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | KOL Telecom Services LLCkoltelecom.com HQ: Wilmington, United StatesReported employees: 11-50 | Wilmington, United States | 11-50 | Exact match | 112 contacts → |
“KOL Telecom is the leading innovator of small business Voice over IP (VoIP) Phone services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Bicom Systemsbicomsystems.com HQ: London, United StatesReported employees: 51-200 | London, United States | 51-200 | Exact match | 106 contacts → |
“Made for businesses of all sizes, Bicom Systems revolutionizes communications by providing PBXware, the world's most unified turnkey open standards hosted telephony platform, plus…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Innovaphoneinnovaphone.com HQ: Sindelfingen, GermanyReported employees: 51-200 | Sindelfingen, Germany | 51-200 | Exact match | 104 contacts → |
“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…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Sarenetsarenet.es HQ: Zamudio, SpainReported employees: 51-200 | Zamudio, Spain | 51-200 | Exact match | 100 contacts → |
“Sarenet es el proveedor de voz y datos con más experiencia de cuantos hoy operan en España.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | CMS Communicationscmsc.com HQ: Chesterfield, MO, United StatesReported employees: 51-200 | Chesterfield, MO, United States | 51-200 | Exact match | 100 contacts → |
“Since its founding in 1985, CMS Communications has been a leader in providing Telecom equipment and services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Coyser SAcoyser.com HQ: Madrid, SpainReported employees: 51-200 | Madrid, Spain | 51-200 | Exact match | 99 contacts → |
“Coyser S.A.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Voip Networksvoipnetworks.com HQ: Cherry Hill, NY, United StatesReported employees: 51-200 | Cherry Hill, NY, United States | 51-200 | Exact match | 86 contacts → |
“Powering Your Companies Voice & More Utilizing the latest technologies in voice such as VoIP (Voice-Over-Internet-Protocol) and other networking technologies, we can provide your…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | HQ: Arvada, CO, United StatesReported employees: 11-50 | Arvada, CO, United States | 11-50 | Exact match | 86 contacts → |
“We make workplace technology work for you.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Unitalkunitalk.cloud HQ: Kyiv, UkraineReported employees: 11-50 | Kyiv, Ukraine | 11-50 | Exact match | 84 contacts → |
“UniTalk - єдине рішення для керування спілкуванням з клієнтами.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | CRIgocri.com HQ: Chattanooga, TN, United StatesReported employees: 11-50 | Chattanooga, TN, United States | 11-50 | Exact match | 81 contacts → |
“For over 30 years, CRI has installed, maintained and serviced business communications systems throughout the Southeastern U.S.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | ICS Communicationsicscomms.co.uk HQ: Camberley, United KingdomReported employees: 11-50 | Camberley, United Kingdom | 11-50 | Exact match | 81 contacts → |
“Contact an expert now: 0800 9 77 88 99 Specialists in providing businesses with telecoms, data and energy since 1989.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Netcarriernetcarrier.com HQ: Audubon, PA, United StatesReported employees: 51-200 | Audubon, PA, United States | 51-200 | Exact match | 80 contacts → |
“NetCarrier Telecom, Inc.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | PC Telcompctelcom.coop HQ: Holyoke, CO, United StatesReported employees: 11-50 | Holyoke, CO, United States | 11-50 | Exact match | 79 contacts → |
“Full Service Telecommunications Provider.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Atsi Business Communications Systemsatsihou.com HQ: Houston, TX, United StatesReported employees: 11-50 | Houston, TX, United States | 11-50 | Exact match | 78 contacts → |
“At ATSI, we believe technology should empower people.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Telecomptelecomp.com HQ: Rogers, AR, United StatesReported employees: 51-200 | Rogers, AR, United States | 51-200 | Exact match | 75 contacts → |
“TeleComp is a full-service technology company offering Enterprise VoIP phone systems, Fiber Bandwidth, Cybersecurity/Compliance and Managed Services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Voipvoicevoipvoice.it HQ: Montelupo Fiorentino, ItalyReported employees: 11-50 | Montelupo Fiorentino, Italy | 11-50 | Exact match | 71 contacts → |
“VoipVoice è il primo Provider Italiano VoIP totalmente Business-Oriented.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Telapplianttelappliant.com HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 70 contacts → |
“Telappliant is an award-winning VoIP and cloud communications provider.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Interglobe Communicationsnyigc.com HQ: Staten Island, United StatesReported employees: 51-200 | Staten Island, United States | 51-200 | Exact match | 68 contacts → |
“Headquartered in New York City, InterGlobe Communications is a one stop network service provider.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
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Office phone system providers: dataset insights
November 6, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
2,874 records in the displayed employee bands.
36 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 2,910 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: November 6, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Office phone system providers by location
12 lists · largest firstEvery Office phone system providers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Office phone system providers based in the United States1,122
- Office phone system providers based in the United Kingdom333
- Office phone system providers based in Canada130
- Office phone system providers based in Germany91
- Office phone system providers based in Brazil89
- Office phone system providers based in Australia88
- Office phone system providers based in France72
- Office phone system providers based in Italy59
- Office phone system providers based in the Netherlands59
- Office phone system providers based in Spain56
Cities
Questions about this company list
What does Exact match mean for office phone system providers?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many office phone system providers did RevenueBase find worldwide?
The saved snapshot records 2,910 matching company records, 21,607 tracked contacts and 4,968 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: November 6, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 office phone system providers worldwide. Snapshot: November 6, 2026. https://revenuebase.ai/companies/browse/office-phone-system-providers.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗