Company lists · Data refreshed September 2026

Top 25 Telephony integration software providers based in the United States

Name: Telephony integration software 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 29, 2026 208 companies tracked

RevenueBase identified 208 telephony integration software providers headquartered in the United States as of September 2026 and tracks 9,193 professional contacts across them, including 4,237 with verified work emails. Atlanta is the largest hub.

This list covers telephony integration software 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 29, 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 29, 2026 86% judged on-target in blind review

208Companies

9,193Contacts tracked

4,237Verified emails

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The 25 largest telephony integration software providers based in the United States

Ranked by team size

Top 25 of 208 telephony integration software providers based in the United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to telephony integration software 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	Ringcentral	Indirect evidence	Belmont, CA, United StatesHQ checked Sep 29, 2026	5,001-10,000	6,431 contacts →
	Indirect 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 Sep 29, 2026
2	Vail Systems	Partial evidence	Chicago, IL, United StatesHQ checked Sep 29, 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 Sep 29, 2026
3	Forerunner Technologies, INC	Indirect evidence	Edgewood, NY, United StatesHQ checked Sep 29, 2026	51-200	184 contacts →
	Indirect evidence “Established in 1988, Forerunner Technologies, Inc.” Source: RevenueBase Database · checked Sep 29, 2026
4	In-Telecom	Indirect evidence	Slidell, LA, United StatesHQ checked Sep 29, 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 29, 2026
5	Unimax	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 29, 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 29, 2026
6	Amtelco	Partial evidence	Mcfarland, WI, United StatesHQ checked Sep 29, 2026	51-200	118 contacts →
	Partial evidence “Amtelco has been a family-owned communication software company since 1976 and devoted to providing secure, stable, and critical communication solutions for healthcare, contact…” Source: RevenueBase Database · checked Sep 29, 2026
7	Openphone	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	51-200	103 contacts →
	Indirect evidence “OpenPhone (now Quo) is the collaborative phone system trusted by teams at over 90k businesses.” Source: RevenueBase Database · checked Sep 29, 2026
8	Alliance Global Communications LLC	Indirect evidence	Plainsboro, NJ, United StatesHQ checked Sep 29, 2026	51-200	91 contacts →
	Indirect evidence “Alliance Global is a cloud-based business phone system provider exclusively for organizations that require professional communication features.” Source: RevenueBase Database · checked Sep 29, 2026
9	AMC Technology	Partial evidence	Richmond, VA, United StatesHQ checked Sep 29, 2026	11-50	90 contacts →
	Partial evidence “AMC Technology is a services-led contact center integration company with over 30 years of hands-on expertise.” Source: RevenueBase Database · checked Sep 29, 2026
10	Geomant	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 29, 2026	51-200	59 contacts →
	Indirect evidence “With offices worldwide and certification by leading technology providers, including Buzzeasy, Avaya, Microsoft, Genesys, and Cisco, Geomant is a well-established, innovative…” Source: RevenueBase Database · checked Sep 29, 2026
11	Xima Software	Partial evidence	South Jordan, UT, United StatesHQ checked Sep 29, 2026	51-200	46 contacts →
	Partial evidence “Xima Software is dedicated to enabling companies to better manage their business through innovative contact center solutions.” Source: RevenueBase Database · checked Sep 29, 2026
12	Clearlyip	Partial evidence	Appleton, WI, United StatesHQ checked Sep 29, 2026	201-500	45 contacts →
	Partial evidence “14IP is a global software development and technology company specialising in telecommunications.” Source: RevenueBase Database · checked Sep 29, 2026
13	Gold Systems	Indirect evidence	Boulder, CO, United StatesHQ checked Sep 29, 2026	51-200	39 contacts →
	Indirect evidence “Gold Systems helps improve your profitability and increase customer satisfaction by developing and implementing unified communications and self-service solutions powered by voice.” Source: RevenueBase Database · checked Sep 29, 2026
14	MANGO	Indirect evidence	St George, UT, United StatesHQ checked Sep 29, 2026	11-50	34 contacts →
	Indirect evidence “Business Phones for Small and Medium Businesses.” Source: RevenueBase Database · checked Sep 29, 2026
15	Intelemedia Communications	Partial evidence	Plano, TX, United StatesHQ checked Sep 29, 2026	51-200	34 contacts →
	Partial evidence “Since 1993, Intelemedia has developed sophisticated telephony and database solutions that transform how organizations more effectively manage call handling and caller experiences…” Source: RevenueBase Database · checked Sep 29, 2026
16	Axxess Networks	Indirect evidence	Blue Bell, PA, United StatesHQ checked Sep 29, 2026	11-50	30 contacts →
	Indirect evidence “Axxess Networks founders have been in the Telecom and IT field for over 40 years.” Source: RevenueBase Database · checked Sep 29, 2026
17	Spark Technology Group INC	Partial evidence	Milton, GA, United StatesHQ checked Sep 29, 2026	11-50	30 contacts →
	Partial evidence “Since it’s foundation in the year 2002, Spark Technology Group Inc provides excellent hosted IVR and integration services.” Source: RevenueBase Database · checked Sep 29, 2026
18	Genusys INC	Indirect evidence	Lewisville, TX, United StatesHQ checked Sep 29, 2026	11-50	28 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026
19	United World Telecom	Partial evidence	Delray Beach, FL, United StatesHQ checked Sep 29, 2026	11-50	26 contacts →
	Partial evidence “United World Telecom is a global cloud telephony provider delivering enterprise-grade voice solutions in over 160 countries.” Source: RevenueBase Database · checked Sep 29, 2026
20	Adrenaline Technologies	Strong evidence	Alpharetta, GA, United StatesHQ checked Sep 29, 2026	51-200	23 contacts →
	Strong evidence “We provide software and integration services to help enterprises transition from phone support to new digital channels and self-service applications.” Source: RevenueBase Database · checked Sep 29, 2026
21	Fastcall	Indirect evidence	Hollywood, CA, United StatesHQ checked Sep 29, 2026	11-50	23 contacts →
	Indirect evidence “Fastcall - a CTI phone and SMS dialer 100% dedicated to and built for Salesforce - boasts some of the highest ratings for CTIs and phone dialer systems in the Salesforce…” Source: RevenueBase Database · checked Sep 29, 2026
22	Landis	Partial evidence	Ephrata, PA, United StatesHQ checked Sep 29, 2026	51-200	22 contacts →
	Partial evidence “Landis Technologies UC Software division provides Contact Center, Attendant Console and other products for Microsoft Teams” Source: RevenueBase Database · checked Sep 29, 2026
23	Voxsun	Indirect evidence	Wilmington, DE, United StatesHQ checked Sep 29, 2026	11-50	22 contacts →
	Indirect evidence “VoxSun Telecom, Inc.” Source: RevenueBase Database · checked Sep 29, 2026
24	Redmond Software	Partial evidence	Miami, FL, United StatesHQ checked Sep 29, 2026	11-50	22 contacts →
	Partial evidence “Redmond Software is a software vendor and systems integrator specialized in the development of advanced telecommunications products, including- Value-Added services platforms for…” Source: RevenueBase Database · checked Sep 29, 2026
25	Phoneiq	Indirect evidence	San Antonio, TX, United StatesHQ checked Sep 29, 2026	11-50	21 contacts →
	Indirect evidence “PhoneIQ is an AI-powered front desk that helps businesses answer every call, capture every opportunity, and never let revenue go to voicemail.” Source: RevenueBase Database · checked Sep 29, 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: telephony integration software 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 telephony integration software providers.
Partial evidence: Its own public description names part of telephony integration software providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name telephony integration software 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 208 telephony integration software providers based in the United States

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Telephony integration software providers based in the United States at a glance

As of Sep 29, 2026

46.1%Verified-email coverage

44.2Average contacts per company

11-50Median size (employees)

3.8%Largest-city concentration · Atlanta

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

5,001-10,000

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 208 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 telephony integration software 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 “telephony integration software 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 telephony integration software 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 telephony integration software 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, 4,237 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 29, 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 telephony integration software 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 telephony integration software providers are there based in the United States?

RevenueBase identified 208 telephony integration software 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?

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

Which city has the most telephony integration software providers?

Atlanta leads with 8 headquartered companies, followed by Dallas (6) and Miami (6).

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 4,237 verified decision-maker contacts tracked across these 208 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 29, 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.