Company lists · Data refreshed September 2026

Top 25 Unified communications services for IT consulting firms based in the United States

Name: Unified communications services for IT consulting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 1,461 companies tracked

RevenueBase identified 1,461 unified communications services for IT consulting firms headquartered in the United States as of September 2026 and tracks 46,291 professional contacts across them, including 13,711 with verified work emails. New York is the largest hub.

This list covers unified communications services for IT consulting firms 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 21, 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 21, 2026 86% judged on-target in blind review

1,461Companies

46,291Contacts tracked

13,711Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest unified communications services for IT consulting firms based in the United States

Ranked by team size

Top 25 of 1,461 unified communications services for IT consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to unified communications services for IT consulting firms: 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	AVAYA	Indirect evidence	Morristown, NJ, United StatesHQ checked Sep 21, 2026	5,001-10,000	10,510 contacts →
	Indirect evidence “At Avaya, we give our customers the freedom to take their business in the directions that benefit them most.” Source: RevenueBase Database · checked Sep 21, 2026
2	ZOOM	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 21, 2026	5,001-10,000	9,706 contacts →
	Indirect evidence “Bring teams together, reimagine workspaces, engage new audiences, and delight your customers –– all on the Zoom AI-first work platform you know and love.” Source: RevenueBase Database · checked Sep 21, 2026
3	GOTO	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,320 contacts →
	Strong 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 21, 2026
4	Polycom	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,787 contacts →
	Indirect evidence “Plantronics and Polycom are now Poly.” Source: RevenueBase Database · checked Sep 21, 2026
5	Intermedia Intelligent Communications	Partial evidence	Sunnyvale, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,254 contacts →
	Partial evidence “Intermedia is the cloud communications company that helps over businesses connect better, from wherever, through our AI-powered platform that includes voice, video conferencing…” Source: RevenueBase Database · checked Sep 21, 2026
6	Integra	Indirect evidence	Vancouver, WA, United StatesHQ checked Sep 21, 2026	501-1,000	1,133 contacts →
	Indirect evidence “Integra is Allstream.” Source: RevenueBase Database · checked Sep 21, 2026
7	Momentum	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	501-1,000	437 contacts →
	Partial evidence “We unleash human momentum with collaboration, connectivity, and communications technology.” Source: RevenueBase Database · checked Sep 21, 2026
8	Fusion Connect	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	201-500	425 contacts →
	Partial evidence “Fusion Connect, an industry leading cloud communications provider, removes complexity so customers can focus on running their business.” Source: RevenueBase Database · checked Sep 21, 2026
9	phone.com	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	398 contacts →
	Partial 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 21, 2026
10	Continuant	Partial evidence	Tacoma, WA, United StatesHQ checked Sep 21, 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 21, 2026
11	Avant Communications	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	263 contacts →
	Indirect evidence “As the nation’s premier distributor of next generation technologies, AVANT has the resources and relationships needed to successfully navigate the ever-changing world of…” Source: RevenueBase Database · checked Sep 21, 2026
12	Cenero	Strong evidence	Malvern, PA, United StatesHQ checked Sep 21, 2026	201-500	252 contacts →
	Strong evidence “Since Cenero has been a service focused audio-visual, unified communications and IT solutions provider.” Source: RevenueBase Database · checked Sep 21, 2026
13	NACR	Partial evidence	Eagan, MN, United StatesHQ checked Sep 21, 2026	501-1,000	252 contacts →
	Partial 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 21, 2026
14	Broadsoft	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 21, 2026	1,001-5,000	252 contacts →
	Strong 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 21, 2026
15	Calltower	Partial evidence	South Jordan, UT, United StatesHQ checked Sep 21, 2026	201-500	226 contacts →
	Partial evidence “Since 2002, CallTower has been at the forefront of transforming global communication, emerging as a leader in enterprise-class cloud communication, collaboration, and CX solutions.” Source: RevenueBase Database · checked Sep 21, 2026
16	Advantage Communications Group	Partial evidence	Port Washington, NY, United StatesHQ checked Sep 21, 2026	51-200	198 contacts →
	Partial evidence “Advantage mitigates the complexity of navigating a constantly evolving IT landscape.” Source: RevenueBase Database · checked Sep 21, 2026
17	Grandstream Networks	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	201-500	191 contacts →
	Strong 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 21, 2026
18	Vertical Communications	Partial evidence	Tempe, AZ, United StatesHQ checked Sep 21, 2026	201-500	175 contacts →
	Partial evidence “Vertical Communications is a leading provider of communications platforms and applications that enable critical business workflows for enterprises across a variety of industries…” Source: RevenueBase Database · checked Sep 21, 2026
19	Firstcomm	Strong evidence	Fairlawn, OH, United StatesHQ checked Sep 21, 2026	51-200	174 contacts →
	Strong evidence “FirstComm delivers smarter business communications and IT solutions that help organizations connect, collaborate, and scale with confidence.” Source: RevenueBase Database · checked Sep 21, 2026
20	Zultys	Strong evidence	Sunnyvale, CA, United StatesHQ checked Sep 21, 2026	51-200	159 contacts →
	Strong evidence “Zultys is a premier provider of omnichannel, Unified Communications, hosted business phone services and premise-based communications systems.” Source: RevenueBase Database · checked Sep 21, 2026
21	In-Telecom	Strong evidence	Slidell, LA, United StatesHQ checked Sep 21, 2026	51-200	151 contacts →
	Strong 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 21, 2026
22	Crexendo Business Solutions	Strong evidence	Tempe, AZ, United StatesHQ checked Sep 21, 2026	51-200	143 contacts →
	Strong evidence “Crexendo®, Inc.(NASDAQ:CXDO) is an award-winning premier provider of Unified Communications as a Service (UCaaS), Call Center as a Service (CCaaS), communication platform software…” Source: RevenueBase Database · checked Sep 21, 2026
23	Access ONE INC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	140 contacts →
	Partial evidence “Access One is a business technology services and communications provider, dedicated to world-class technologies and an award-winning client experience.” Source: RevenueBase Database · checked Sep 21, 2026
24	Unifiedcommunications	Indirect evidence	Houston, TX, United StatesHQ checked Sep 21, 2026	51-200	129 contacts →
	Indirect evidence “We’re a team that lives and breathes technology, and we care deeply about the people we serve.” Source: RevenueBase Database · checked Sep 21, 2026
25	Panterra Networks	Strong evidence	San Jose, CA, United StatesHQ checked Sep 21, 2026	51-200	126 contacts →
	Strong evidence “PanTerra is a business-class Unified Cloud Service Provider, seamlessly delivering unified communications, team collaboration, call center, file sync & share, and business…” Source: RevenueBase Database · checked Sep 21, 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: unified communications services for IT consulting firms. 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 unified communications services for IT consulting firms.
Partial evidence: Its own public description names part of unified communications services for IT consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name unified communications services for IT consulting firms. 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 1,461 unified communications services for IT consulting firms based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 13,711 reachable decision-makers.

Free signup · no credit card

View the full list →

Unified communications services for IT consulting firms based in the United States at a glance

As of Sep 21, 2026

29.6%Verified-email coverage

31.7Average contacts per company

1-10Median size (employees)

3.1%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

754

11-50

510

51-200

147

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 1,461 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 unified communications services for IT consulting firms, 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 “unified communications services for IT consulting firms”. 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 unified communications services for IT consulting firms), 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 unified communications services for IT consulting firms, 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, 13,711 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 21, 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.

Unified communications services for IT consulting firms 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 unified communications services for IT consulting firms, 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 unified communications services for IT consulting firms are there based in the United States?

RevenueBase identified 1,461 unified communications services for IT consulting firms 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?

AVAYA, headquartered in Morristown, tops this list with the largest team on record.

Which city has the most unified communications services for IT consulting firms?

New York leads with 46 headquartered companies, followed by Houston (35) and Dallas (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 13,711 verified decision-maker contacts tracked across these 1,461 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 21, 2026.

Ready to reach these companies? Verified emails and direct dials for all 1,461 unified communications services for IT consulting firms based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Unified communications services for IT consulting firms by geography

Browse the directory

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.