Company lists · Data refreshed September 2026

Top 25 Outsourced sales call centers worldwide

Name: Outsourced sales call centers worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 10,548 companies tracked

RevenueBase identified 10,548 company matches for outsourced sales call centers worldwide as of September 2026 and tracks 383,558 professional contacts across them, including 26,975 with verified work emails. The United States is the largest market and Lahore the largest hub.

This list covers company matches for outsourced sales 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 September 29, 2026. Country and city lists for outsourced sales 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 Sep 29, 2026 How this list was built

10,548Companies

383,558Contacts tracked

26,975Verified emails

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The 25 largest outsourced sales call centers worldwide

Ranked by team size

Top 25 of 10,548 company matches for outsourced sales call centers worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 29, 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	Ienergizer	Exact match	Noida, IndiaHQ recorded Sep 29, 2026	10001+	14,745 contacts →
	Exact match “iEnergizer is a leading Business Process Outsourcing provider (“BPO”) of customer management solutions dedicated to delivering performance while actively supporting and advocating…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
2	Turkcell Global Bilgi	Exact match	Beyoglu, TürkiyeHQ recorded Sep 29, 2026	10001+	6,167 contacts →
	Exact match “Bir Turkcell grup şirketi olarak yılında kurulduğumuzda amacımız hep eşsiz bir müşteri deneyimi yaşatmaktı.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
3	Afni, INC	Exact match	Bloomington, IL, United StatesHQ recorded Sep 29, 2026	10001+	5,553 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 · Sep 29, 2026 · View company records in RevenueBase
4	Emtelco S.A	Exact match	Medellín, ColombiaHQ recorded Sep 29, 2026	10001+	4,998 contacts →
	Exact match “Maximizamos el valor de cada contacto de las empresas con sus clientes, gestionando los procesos de relacionamiento a través de canales tefónicos, virtuales y presenciales.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
5	Continuum Global Solutions	Exact match	Dallas, TX, United StatesHQ recorded Sep 29, 2026	5,001-10,000	4,342 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 · Sep 29, 2026 · View company records in RevenueBase
6	Ibex. Pakistan	Exact match	Karachi, PakistanHQ recorded Sep 29, 2026	10001+	4,161 contacts →
	Exact match “ibex.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
7	Callink	Exact match	Uberlândia, BrazilHQ recorded Sep 29, 2026	5,001-10,000	4,126 contacts →
	Exact match “Mais que call center: soluções que transformam o seu negócio e a jornada dos clientes!” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
8	Vikstar Contact Center	Exact match	Sao Paulo, BrazilHQ recorded Sep 29, 2026	10001+	3,914 contacts →
	Exact match “Vikstar is one of the biggest contact centers of Brazil.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
9	Sercom	Exact match	Taboão Da Serra, BrazilHQ recorded Sep 29, 2026	5,001-10,000	3,785 contacts →
	Exact match “Founded in 1993, since the beginning Sercom has stood out in the Contact Center Services.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
10	GSS Global Sales Solutions	Exact match	Madrid, SpainHQ recorded Sep 29, 2026	10001+	3,716 contacts →
	Exact match “is a tech company specialized in providing, and for.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
11	Teleperformance Global Services	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	1,001-5,000	3,346 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
12	Telvista	Exact match	Dallas, TX, United StatesHQ recorded Sep 29, 2026	1,001-5,000	3,122 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 · Sep 29, 2026 · View company records in RevenueBase
13	Extensya	Exact match	Amman, JordanHQ recorded Sep 29, 2026	1,001-5,000	3,071 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 · Sep 29, 2026 · View company records in RevenueBase
14	EPX Eperformax Contact Centers	Exact match	Pasay City, PhilippinesHQ recorded Sep 29, 2026	5,001-10,000	3,061 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 · Sep 29, 2026 · View company records in RevenueBase
15	Grupo Contax	Exact match	São Paulo, BrazilHQ recorded Sep 29, 2026	10001+	2,859 contacts →
	Exact match “Líder em Contact Center na América Latina e um dos maiores do mundo em BPO, especializado em soluções para gestão do relacionamento com o consumidor, o Grupo Contax atua de…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
16	Advanced Call Center Technologies, LLC	Exact match	Berwyn, PA, United StatesHQ recorded Sep 29, 2026	5,001-10,000	2,774 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 · Sep 29, 2026 · View company records in RevenueBase
17	Stream Global Services	Exact match	Eagan, MN, United StatesHQ recorded Sep 29, 2026	10001+	2,772 contacts →
	Exact match “Stream Global Services is a premium business process outsource (BPO) service provider specializing in customer relationship management solutions including sales, customer care…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
18	Nexa BPO	Exact match	Bogotá D.c, ColombiaHQ recorded Sep 29, 2026	5,001-10,000	2,342 contacts →
	Exact match “Más que un contact center y BPO, somos el partner que asegura que la experiencia de tus clientes sea increíble.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
19	CAT Technologies Argentina	Exact match	Buenos Aires, ArgentinaHQ recorded Sep 29, 2026	1,001-5,000	2,221 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 · Sep 29, 2026 · View company records in RevenueBase
20	Vemsertahto	Exact match	Goiania, BrazilHQ recorded Sep 29, 2026	5,001-10,000	2,176 contacts →
	Exact match “Somos a Tahto, uma empresa referência em soluções de CX e BPO.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
21	Alta Resources	Exact match	Neenah, WI, United StatesHQ recorded Sep 29, 2026	1,001-5,000	2,046 contacts →
	Exact match “Alta Resources has always worked to be something different.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
22	Transcosmos INC	Exact match	Toshima-ku, JapanHQ recorded Sep 29, 2026	10001+	1,987 contacts →
	Exact match “transcosmos launched its operations in 1966.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
23	Allied Global	Exact match	GuatemalaHQ recorded Sep 29, 2026	5,001-10,000	1,979 contacts →
	Exact match “Regardless of your Company’s size (from Start-ups to Fortune 500), business vertical or service requirements, we act as a seamless extension of your team to help you grow, and…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
24	Gear INC	Exact match	SingaporeHQ recorded Sep 29, 2026	5,001-10,000	1,974 contacts →
	Exact match “Empowering Global Brands Through Custom BPO Solutions Gear Inc delivers business process outsourcing solutions designed to meet the unique challenges of leading enterprises.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
25	Infocision Management Corporation	Exact match	Akron, OH, United StatesHQ recorded Sep 29, 2026	1,001-5,000	1,764 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 · Sep 29, 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 “outsourced sales 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 10,548 outsourced sales call centers worldwide

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Outsourced sales call centers worldwide at a glance

As of Sep 29, 2026

7.0%Verified-email coverage

36.4Average contacts per company

11-50Median size (employees)

1.8%Largest-city concentration · Lahore

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

2,511

11-50

3,690

51-200

2,566

201-500

940

501-1,000

395

1,001-5,000

325

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 outsourced sales call centers are linked below.
What qualifies: Company records worldwide whose business descriptions match “outsourced sales 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 26,975 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 September 29, 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.

Outsourced sales call centers by location

50 lists · largest first

Every Outsourced sales 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 “outsourced sales call centers”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many outsourced sales call centers are there worldwide?

RevenueBase identified 10,548 company matches for outsourced sales call centers worldwide as of September 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?

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

Which country has the most outsourced sales call centers?

The United States leads with 1,794 companies, followed by India (948) and Pakistan (736). Every outsourced sales call centers list by country and city is linked on this page.

Which city has the most outsourced sales call centers?

Lahore leads with 195 company records, followed by Rawalpindi (158) and Karachi (138).

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 26,975 professional contacts with verified work emails tracked across these 10,548 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 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 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.