Company lists · Data refreshed October 2026

Top 25 Call center infrastructure software companies based in the United States

Name: Call center infrastructure software companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 564 companies tracked

RevenueBase identified 564 call center infrastructure software companies headquartered in the United States as of October 2026 and tracks 28,890 professional contacts across them, including 6,208 with verified work emails. Atlanta is the largest hub.

This list covers call center infrastructure software companies 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 October 1, 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 Oct 1, 2026 86% judged on-target in blind review

564Companies

28,890Contacts tracked

6,208Verified emails

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The 25 largest call center infrastructure software companies based in the United States

Ranked by team size

Top 25 of 564 call center infrastructure software companies based in the United States, ranked by team size, largest first. Data refreshed Oct 1, 2026. RevenueBase Smart Search rates how each company's information relates to call center infrastructure software companies: 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	Ringcentral	Partial evidence	Belmont, CA, United StatesHQ checked Oct 1, 2026	5,001-10,000	6,431 contacts →
	Partial evidence “RingCentral, Inc.(NYSE: RNG) is a global leader in AI–powered customer engagement, delivering an integrated platform for business phone, SMS, contact center, workforce engagement…” Source: RevenueBase Database · checked Oct 1, 2026
2	Telvista	Indirect evidence	Dallas, TX, United StatesHQ checked Oct 1, 2026	1,001-5,000	3,122 contacts →
	Indirect evidence “Email: info@Telvista.com Telvista is a premier provider of contact solutions that drive customer loyalty and create competitive advantage for our clients.” Source: RevenueBase Database · checked Oct 1, 2026
3	Answernet	Indirect evidence	Horsham, PA, United StatesHQ checked Oct 1, 2026	501-1,000	883 contacts →
	Indirect evidence “If you are interested in growing your business or increasing efficiency, AnswerNet has the expertise, technology, and people to help you take your company to new heights!” Source: RevenueBase Database · checked Oct 1, 2026
4	Aspect Software	Indirect evidence	Boulder, CO, United StatesHQ checked Oct 1, 2026	1,001-5,000	878 contacts →
	Indirect evidence “Decades of expertise distilled into innovative workforce tools.” Source: RevenueBase Database · checked Oct 1, 2026
5	Focus Services	Indirect evidence	Roy, UT, United StatesHQ checked Oct 1, 2026	1,001-5,000	792 contacts →
	Indirect evidence “Focus was founded in 1995.” Source: RevenueBase Database · checked Oct 1, 2026
6	The Call Center Doctors	Strong evidence	Houston, TX, United StatesHQ checked Oct 1, 2026	501-1,000	561 contacts →
	Strong evidence “We build fully managed call centers: Software build outs Hiring Training Integrations” Source: RevenueBase Database · checked Oct 1, 2026
7	American Customer Care	Indirect evidence	Bristol, CT, United StatesHQ checked Oct 1, 2026	1,001-5,000	513 contacts →
	Indirect evidence “American Customer Care specializes in providing individualized contact with your customers.” Source: RevenueBase Database · checked Oct 1, 2026
8	Alvaria CX	Partial evidence	Atlanta, GA, United StatesHQ checked Oct 1, 2026	1,001-5,000	478 contacts →
	Partial evidence “Alvaria CX, the global leader in contact center solutions, emerged from the 2021 merger of Noble Systems and Aspect, bringing over 50 years of CX innovation.” Source: RevenueBase Database · checked Oct 1, 2026
9	Ansafone Contact Centers	Partial evidence	Santa Ana, CA, United StatesHQ checked Oct 1, 2026	501-1,000	431 contacts →
	Partial evidence “About : Ansafone is the leading outsourced contact center solution provider for companies in the US and Canada and maintains international alliances for global reach.” Source: RevenueBase Database · checked Oct 1, 2026
10	The Connection Contact Center	Partial evidence	Bloomington, MN, United StatesHQ checked Oct 1, 2026	1,001-5,000	354 contacts →
	Partial evidence “For over 35 years, The Connection has made a name for ourselves becoming one of the top industry partners to Fortune 500 companies looking to outsource their contact center…” Source: RevenueBase Database · checked Oct 1, 2026
11	Five Star Call Centers	Strong evidence	Sioux Falls, SD, United StatesHQ checked Oct 1, 2026	1,001-5,000	329 contacts →
	Strong evidence “Five Star Call Centers is a onshore and nearshore contact center outsourcer where we deliver outrageously amazing customer experiences for our clients and their customers.” Source: RevenueBase Database · checked Oct 1, 2026
12	Kana Software	Indirect evidence	Santa Clara, CA, United StatesHQ checked Oct 1, 2026	501-1,000	307 contacts →
	Indirect evidence “KANA understands the value of great Customer Service experiences.” Source: RevenueBase Database · checked Oct 1, 2026
13	Outplex	Indirect evidence	Fort Lauderdale, FL, United StatesHQ checked Oct 1, 2026	1,001-5,000	301 contacts →
	Indirect evidence “OutPLEX is a leading international digital and voice customer contact management services organization developing solutions for the world's most trusted brands.” Source: RevenueBase Database · checked Oct 1, 2026
14	Calltend INC	Indirect evidence	Los Angeles, TX, United StatesHQ checked Oct 1, 2026	51-200	289 contacts →
	Indirect evidence “Current Vertical Focus: Real Estate - Lead Generation, Lead Conversion, Lead Qualification, Agent Recruiting Mortgage - Lead Conversion, Lead Qualification Insurance - Lead…” Source: RevenueBase Database · checked Oct 1, 2026
15	Expertcallers	Indirect evidence	Princeton, NJ, United StatesHQ checked Oct 1, 2026	501-1,000	264 contacts →
	Indirect evidence “ExpertCallers (a division of Flatworld Solutions) is a global consulting and outsourcing company, with a wealth of experience in providing operational and strategic excellence to…” Source: RevenueBase Database · checked Oct 1, 2026
16	TCN	Partial evidence	St. George, UT, United StatesHQ checked Oct 1, 2026	201-500	246 contacts →
	Partial evidence “A leader in the hosted contact center technology industry since TCN, Inc.” Source: RevenueBase Database · checked Oct 1, 2026
17	Anomaly Squared	Partial evidence	Greensboro, NC, United StatesHQ checked Oct 1, 2026	201-500	216 contacts →
	Partial evidence “Schedule your FREE Consultation here: http://bit.ly/2gUckQb Anomaly Squared is a contact center services provider.” Source: RevenueBase Database · checked Oct 1, 2026
18	Vail Systems	Partial evidence	Chicago, IL, United StatesHQ checked Oct 1, 2026	51-200	214 contacts →
	Partial 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 Oct 1, 2026
19	Hammer	Partial evidence	Billerica, MA, United StatesHQ checked Oct 1, 2026	501-1,000	192 contacts →
	Partial evidence “Migrating a contact center to the cloud can seem a strenuous task.” Source: RevenueBase Database · checked Oct 1, 2026
20	American Support	Strong evidence	Jacksonville, FL, United StatesHQ checked Oct 1, 2026	501-1,000	192 contacts →
	Strong evidence “With nine call centers located in America, El Salvador, Nicaragua, the Dominican Republic and the Philippines, Bernard works with some of America's largest companies to provide…” Source: RevenueBase Database · checked Oct 1, 2026
21	Signia	Indirect evidence	Westminster, CO, United StatesHQ checked Oct 1, 2026	201-500	181 contacts →
	Indirect evidence “Signia aims to provide marketing services to targeted business environments in the US.” Source: RevenueBase Database · checked Oct 1, 2026
22	Gold Mountain Communications	Strong evidence	Springfield, MO, United StatesHQ checked Oct 1, 2026	201-500	180 contacts →
	Strong evidence “Gold Mountain Communications is a US-based live operator inbound/outbound call center and service agency helping leading national corporations outsource their customer service and…” Source: RevenueBase Database · checked Oct 1, 2026
23	Callsexperts	Strong evidence	New York, United StatesHQ checked Oct 1, 2026	501-1,000	173 contacts →
	Strong evidence “Calls Experts is a global contact center solution provider.” Source: RevenueBase Database · checked Oct 1, 2026
24	AVOXI	Indirect evidence	Atlanta, GA, United StatesHQ checked Oct 1, 2026	51-200	166 contacts →
	Indirect evidence “At AVOXI, we believe that voice conversations are essential for businesses to connect with customers across the globe.” Source: RevenueBase Database · checked Oct 1, 2026
25	Ivox Solutions	Partial evidence	Port St Lucie, FL, United StatesHQ checked Oct 1, 2026	201-500	158 contacts →
	Partial evidence “iVox Solutions is a leader in the contact center industry.” Source: RevenueBase Database · checked Oct 1, 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: call center infrastructure software companies. 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 call center infrastructure software companies.
Partial evidence: Its own public description names part of call center infrastructure software companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name call center infrastructure software companies. 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 564 call center infrastructure software companies based in the United States

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Call center infrastructure software companies based in the United States at a glance

As of Oct 1, 2026

21.5%Verified-email coverage

51.2Average contacts per company

11-50Median size (employees)

3.4%Largest-city concentration · Atlanta

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

127

11-50

196

51-200

139

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 564 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 call center infrastructure software companies, 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 “call center infrastructure software companies”. 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 call center infrastructure software companies), 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 call center infrastructure software companies, 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, 6,208 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 October 1, 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.

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 call center infrastructure software companies, 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 call center infrastructure software companies are there based in the United States?

RevenueBase identified 564 call center infrastructure software companies headquartered in the United States as of October 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?

Ringcentral, headquartered in Belmont, tops this list with the largest team on record.

Which city has the most call center infrastructure software companies?

Atlanta leads with 19 headquartered companies, followed by Miami (15) and New York (13).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 6,208 verified decision-maker contacts tracked across these 564 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 1, 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.