Company lists · Data refreshed November 2026

Top 25 Telecom services providers for call centers worldwide

Name: Telecom services providers for call centers worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 5, 2026 11,321 companies tracked

RevenueBase identified 11,321 company matches for telecom services providers for call centers worldwide as of November 2026 and tracks 393,356 professional contacts across them, including 58,328 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers company matches for telecom services providers for call centers 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 5, 2026. Country and city lists for telecom services providers for call centers 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Nov 5, 2026 How this list was built

11,321Companies

393,356Contacts tracked

58,328Verified emails

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

The 25 largest telecom services providers for call centers worldwide

Ranked by team size

Top 25 of 11,321 company matches for telecom services providers for call centers worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 5, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Windstream	Exact match	Little Rock, AR, United StatesHQ recorded Nov 5, 2026	10001+	7,649 contacts →
	Exact match “Windstream and Uniti have merged - Please follow us at Uniti Group, Inc.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
2	Turkcell Global Bilgi	Exact match	Beyoglu, TürkiyeHQ recorded Nov 5, 2026	10001+	6,889 contacts →
	Exact match “Bir Turkcell grup şirketi olarak yılında kurulduğumuzda amacımız hep eşsiz bir müşteri deneyimi yaşatmaktı.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
3	Ringcentral	Exact match	Belmont, United StatesHQ recorded Nov 5, 2026	5,001-10,000	6,795 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
4	Afni, INC	Exact match	Bloomington, United StatesHQ recorded Nov 5, 2026	10001+	6,716 contacts →
	Exact match “When people reach for their phones, use laptops, or grab their tablets, Afni's contact center teams are there to provide prompt and friendly help.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
5	Continuum Global Solutions	Exact match	Dallas, TX, United StatesHQ recorded Nov 5, 2026	5,001-10,000	4,798 contacts →
	Exact match “With a fresh name and decades of contact center expertise, we’re dedicated to collaborative partnerships, understanding your unique needs, and tailoring solutions for an enhanced…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
6	Vikstar Contact Center	Exact match	Sao Paulo, BrazilHQ recorded Nov 5, 2026	10001+	4,363 contacts →
	Exact match “Vikstar is one of the biggest contact centers of Brazil.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
7	Sercom	Exact match	Taboão Da Serra, BrazilHQ recorded Nov 5, 2026	5,001-10,000	4,283 contacts →
	Exact match “Founded in 1993, since the beginning Sercom has stood out in the Contact Center Services.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
8	Spark NEW Zealand	Exact match	Cbd, New ZealandHQ recorded Nov 5, 2026	5,001-10,000	4,233 contacts →
	Exact match “In today’s fast-paced digital world, Spark is here to help all New Zealanders stay ahead.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
9	Spectrum Business	Exact match	Stamford, CT, United StatesHQ recorded Nov 5, 2026	10001+	4,135 contacts →
	Exact match “Our story starts with understanding that connectivity powers everything you do, and we make it stronger.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
10	EPX Eperformax Contact Centers	Exact match	Pasay City, PhilippinesHQ recorded Nov 5, 2026	5,001-10,000	3,904 contacts →
	Exact match “ePerformax is a high-performing contact center & BPO that provides world-class, omnichannel service and support to a select group of Fortune companies and their customers.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
11	MITEL	Exact match	Kanata, ON, CanadaHQ recorded Nov 5, 2026	1,001-5,000	3,738 contacts →
	Exact match “Powering more than 2 billion connections every day, Mitel helps businesses connect, collaborate and take care of customers.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
12	TMKT	Exact match	Poa, BrazilHQ recorded Nov 5, 2026	5,001-10,000	3,730 contacts →
	Exact match “A TMKT é uma empresa de Contact Center que foi fundada em 1991 e se tornou uma referência no mercado de Customer Experience (CX).” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
13	Quantrics Enterprises INC	Exact match	Taytay, PhilippinesHQ recorded Nov 5, 2026	5,001-10,000	3,611 contacts →
	Exact match “In the Philippines, Quantrics by NQX is redefining customer experience by bringing together the expertise of a global leader and the passion of world-class Filipino talent.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
14	Telvista	Exact match	Dallas, TX, United StatesHQ recorded Nov 5, 2026	1,001-5,000	3,517 contacts →
	Exact match “Email: info@Telvista.com Telvista is a premier provider of contact solutions that drive customer loyalty and create competitive advantage for our clients.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
15	Extensya	Exact match	Amman, JordanHQ recorded Nov 5, 2026	1,001-5,000	3,426 contacts →
	Exact match “Extensya is a company that primarily specializes in contact management solutions and business process outsourcing services, with a network of fully equipped contact centers in…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
16	Advanced Call Center Technologies, LLC	Exact match	Berwyn, PA, United StatesHQ recorded Nov 5, 2026	5,001-10,000	3,116 contacts →
	Exact match “Advanced Call Center Technologies, LLC (ACT) is a premier provider of domestic (USA), near shore and far shore outsourced call center services to the financial services, mortgage…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
17	Airtel Business	Exact match	Gurgaon, IndiaHQ recorded Nov 5, 2026	10001+	2,862 contacts →
	Exact match “The B2B arm of Bharti Airtel, we are India's leading provider of secure and reliable connectivity, technology, and communications solutions.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
18	CAT Technologies Argentina	Exact match	Buenos Aires, FL, ArgentinaHQ recorded Nov 5, 2026	1,001-5,000	2,460 contacts →
	Exact match “Somos la compañía líder en Servicios Next Gen de Contact Center, Business Process Outsourcing (BPO) y Customer Experience (CX).” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
19	Granite Telecommunications	Exact match	Quincy, MA, United StatesHQ recorded Nov 5, 2026	1,001-5,000	2,395 contacts →
	Exact match “Granite is a dynamic and rapidly growing company serving the exciting and demanding Telecommunications market.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
20	Vemsertahto	Exact match	Goiania, BrazilHQ recorded Nov 5, 2026	5,001-10,000	2,389 contacts →
	Exact match “Somos a Tahto, uma empresa referência em soluções de CX e BPO.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
21	VERO	Exact match	Sao Paulo, BrazilHQ recorded Nov 5, 2026	1,001-5,000	2,282 contacts →
	Exact match “Somos a Vero, uma empresa de telecomunicações brasileira.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
22	Support Services Group	Exact match	Waco, United StatesHQ recorded Nov 5, 2026	5,001-10,000	2,055 contacts →
	Exact match “Support Services Group (SSG) helps businesses accelerate growth and earn customers for life through high-touch, outsourced engagement center services.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
23	Unifique	Exact match	Timbó, BrazilHQ recorded Nov 5, 2026	1,001-5,000	1,962 contacts →
	Exact match “Somos uma empresa de telecomunicações com 28 anos de atuação.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
24	Infocision Management Corporation	Exact match	Akron, OH, United StatesHQ recorded Nov 5, 2026	1,001-5,000	1,947 contacts →
	Exact match “InfoCision is an award-winning contact center partner trusted by leading brands for over 40 years.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
25	Km2 Solutions	Exact match	Boca Raton, United StatesHQ recorded Nov 5, 2026	5,001-10,000	1,921 contacts →
	Exact match “Award-winning outsourcing partner with two decades of experience operating an exclusively nearshore strategy that delivers better performance, close to home, and at a lower cost.” Recorded in the RevenueBase company graph · Nov 5, 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 “telecom services providers for call centers”. 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 11,321 telecom services providers for call centers worldwide

See the full list, filter by size, metro and specialty, and access 58,328 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Telecom services providers for call centers worldwide at a glance

As of Nov 5, 2026

14.8%Verified-email coverage

34.7Average contacts per company

11-50Median size (employees)

1.7%Largest-city concentration · Sao Paulo

Nov 5, 2026Page data refreshed

Companies by employee count

1-10

3,500

11-50

4,306

51-200

2,129

201-500

656

501-1,000

302

1,001-5,000

268

5,001-10,000

10001+

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 telecom services providers for call centers are linked below.
What qualifies: Company records worldwide whose business descriptions match “telecom services providers for call centers” 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 58,328 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 5, 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.

Telecom services providers for call centers by location

79 lists · largest first

Every Telecom services providers for call centers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 “telecom services providers for call centers”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many telecom services providers for call centers are there worldwide?

RevenueBase identified 11,321 company matches for telecom services providers for call centers 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?

Windstream tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most telecom services providers for call centers?

The United States leads with 2,269 companies, followed by the United Kingdom (855) and Brazil (702). Every telecom services providers for call centers list by country and city is linked on this page.

Which city has the most telecom services providers for call centers?

Sao Paulo leads with 187 company records, followed by London (158) and Lahore (93).

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 58,328 professional contacts with verified work emails tracked across these 11,321 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 5, 2026.

Ready to reach these companies? Verified emails and direct dials for all 11,321 telecom services providers for call centers worldwide. Start with a free account, no credit card.

Download this list →

Related lists

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 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.