Company lists · Data refreshed September 2026

Top 25 Enterprise telephony providers based in the United States

Name: Enterprise telephony providers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 1,721 companies tracked

RevenueBase identified 1,721 enterprise telephony providers headquartered in the United States as of September 2026 and tracks 28,079 professional contacts across them, including 8,725 with verified work emails. New York is the largest hub.

This list covers enterprise telephony providers headquartered in the United States, 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.

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

1,721Companies

28,079Contacts tracked

8,725Verified emails

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The 25 largest enterprise telephony providers based in the United States

Ranked by team size

Top 25 of 1,721 enterprise telephony providers based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to enterprise telephony providers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	GOTO	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,320 contacts →
	Indirect evidence “As the leader in cloud communications and IT, GoTo addresses real-world challenges with practical innovations and a customer-first mindset.” Source: RevenueBase Database · checked Sep 28, 2026
2	Granite Telecommunications	Indirect evidence	Quincy, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,270 contacts →
	Indirect evidence “Granite is a dynamic and rapidly growing company serving the exciting and demanding Telecommunications market.” Source: RevenueBase Database · checked Sep 28, 2026
3	Integra	Indirect evidence	Vancouver, WA, United StatesHQ checked Sep 28, 2026	501-1,000	1,133 contacts →
	Indirect evidence “Integra is Allstream.” Source: RevenueBase Database · checked Sep 28, 2026
4	Ooma, INC	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 28, 2026	501-1,000	606 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 28, 2026
5	phone.com	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	201-500	398 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 28, 2026
6	Logix Fiber Networks	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	201-500	371 contacts →
	Indirect evidence “LOGIX FIBER NETWORKS is a well-established Texas-based provider of telecommunications services since 1983.” Source: RevenueBase Database · checked Sep 28, 2026
7	Continuant	Partial evidence	Tacoma, WA, United StatesHQ checked Sep 28, 2026	201-500	366 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
8	ACS	Partial evidence	Lake Mary, FL, United StatesHQ checked Sep 28, 2026	n/a	358 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
9	BCM ONE	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	501-1,000	308 contacts →
	Partial evidence “Founded in 1992, BCM One is a corporate communications company that powers business connectivity for organizations ranging from SMBs to global enterprises.” Source: RevenueBase Database · checked Sep 28, 2026
10	ACC Business	Indirect evidence	Rochester, NY, United StatesHQ checked Sep 28, 2026	51-200	260 contacts →
	Indirect evidence “ACC Business was founded on a simple idea: provide small to mid-sized businesses first-rate telecom services with dedicated customer service, all at a competitive price.” Source: RevenueBase Database · checked Sep 28, 2026
11	Broadsoft	Indirect evidence	Gaithersburg, MD, United StatesHQ checked Sep 28, 2026	1,001-5,000	252 contacts →
	Indirect evidence “BroadSoft, now part of Cisco, is the leading provider of software and services that enable mobile, fixed-line and cable service providers to offer Unified Communications over…” Source: RevenueBase Database · checked Sep 28, 2026
12	Vail Systems	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	214 contacts →
	Indirect evidence “For over thirty years, Fortune 500 companies in financial services, retail and hospitality, software, and wireless communications industries have relied on Vail Systems’…” Source: RevenueBase Database · checked Sep 28, 2026
13	Grandstream Networks	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	201-500	191 contacts →
	Indirect evidence “Grandstream has been connecting the world since 2002 with unified communications and networking solutions that make communicating more impactful than ever before.” Source: RevenueBase Database · checked Sep 28, 2026
14	Forerunner Technologies, INC	Indirect evidence	Edgewood, NY, United StatesHQ checked Sep 28, 2026	51-200	184 contacts →
	Indirect evidence “Established in 1988, Forerunner Technologies, Inc.” Source: RevenueBase Database · checked Sep 28, 2026
15	Firstcomm	Indirect evidence	Fairlawn, OH, United StatesHQ checked Sep 28, 2026	51-200	174 contacts →
	Indirect evidence “FirstComm delivers smarter business communications and IT solutions that help organizations connect, collaborate, and scale with confidence.” Source: RevenueBase Database · checked Sep 28, 2026
16	Fortis	Indirect evidence	Sacramento, CA, United StatesHQ checked Sep 28, 2026	n/a	170 contacts →
	Indirect evidence “Fortis is a Sacramento Area provider of managed IT services, hosted VoIP, and high speed, redundant internet.” Source: RevenueBase Database · checked Sep 28, 2026
17	Zultys	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 28, 2026	51-200	159 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 28, 2026
18	IT Voice	Indirect evidence	Birmingham, AL, United StatesHQ checked Sep 28, 2026	51-200	154 contacts →
	Indirect evidence “IT Voice specializes in Managed IT and VoIP solutions.” Source: RevenueBase Database · checked Sep 28, 2026
19	In-Telecom	Indirect evidence	Slidell, LA, United StatesHQ checked Sep 28, 2026	51-200	151 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
20	ANI Networks	Indirect evidence	Las Vegas, United StatesHQ checked Sep 28, 2026	201-500	145 contacts →
	Indirect evidence “ANI Networks is a leader in the wholesale, carrier-class telecommunications industry.” Source: RevenueBase Database · checked Sep 28, 2026
21	Unimax	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 28, 2026	51-200	133 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
22	Powernet CO	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 28, 2026	51-200	128 contacts →
	Indirect evidence “Built from a foundation of integrity and strong business ethics, Powernet was established in 1992 in the basement of President Bernie Stevens' Cincinnati home.” Source: RevenueBase Database · checked Sep 28, 2026
23	Transcom Telecommunications	Indirect evidence	Signal Hill, CA, United StatesHQ checked Sep 28, 2026	11-50	127 contacts →
	Indirect evidence “Transcom Telecommunications (formerly called "Transcom Services") is a Veteran Owned Business founded in 1986 on 3 core ideas.” Source: RevenueBase Database · checked Sep 28, 2026
24	Altura Communication Solutions	Indirect evidence	Fullerton, CA, United StatesHQ checked Sep 28, 2026	201-500	123 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
25	Teleco, INC	Indirect evidence	Greenville, SC, United StatesHQ checked Sep 28, 2026	51-200	122 contacts →
	Indirect evidence “WHY TELECO At TELECO, we believe that business owners deserve access to the same advantage-creating technologies mega corporations depend on for their success.” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: enterprise telephony providers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names enterprise telephony providers.
Partial evidence: Its own public description names part of enterprise telephony providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name enterprise telephony providers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,721 enterprise telephony providers based in the United States

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Enterprise telephony providers based in the United States at a glance

As of Sep 28, 2026

31.1%Verified-email coverage

16.3Average contacts per company

11-50Median size (employees)

3.4%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

723

11-50

783

51-200

173

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,721 companies.

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 providers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “enterprise telephony providers”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names enterprise telephony providers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among enterprise telephony providers, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 8,725 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 providers by metro

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 providers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many enterprise telephony providers are there based in the United States?

RevenueBase identified 1,721 enterprise telephony providers headquartered in the United States 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 city has the most enterprise telephony providers?

New York leads with 58 headquartered companies, followed by Dallas (29) and Houston (27).

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 8,725 verified decision-maker contacts tracked across these 1,721 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.