Company lists · Data refreshed September 2026

Top 25 Sales outsourcing call centers worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 15, 2026 7,616 companies tracked

RevenueBase identified 7,616 sales outsourcing call centers worldwide as of September 2026 and tracks 432,044 professional contacts across them, including 38,498 with verified work emails and 0 with mobile numbers. The United States is the largest market and Lahore the largest hub.

This list covers sales outsourcing call centers worldwide, 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 15, 2026. Country and city lists for sales outsourcing call centers follow the table.

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 15, 2026 86% judged on-target in blind review

7,616Companies

432,044Contacts tracked

38,498Verified emails

0Mobile numbers

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The 25 largest sales outsourcing call centers worldwide

Ranked by team size

Top 25 of 7,616 sales outsourcing call centers worldwide, ranked by team size, largest first. Data refreshed Sep 15, 2026. RevenueBase Smart Search rates how each company's information relates to sales outsourcing call centers: 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	Konecta	Partial evidence	Madrid, SpainHQ checked Sep 15, 2026	10001+	23,763 contacts →
	Partial evidence “Konecta is a leading innovative global service provider in customer management business process outsourcing, with passionate employees working in 40 languages across 4 continents…” Source: RevenueBase Database · checked Sep 15, 2026
2	IBEX	Partial evidence	Washington, DC, United StatesHQ checked Sep 15, 2026	10001+	15,457 contacts →
	Partial evidence “ibex delivers innovative business process outsourcing (BPO), smart digital marketing, online acquisition technology, and end-to-end customer engagement solutions to help companies…” Source: RevenueBase Database · checked Sep 15, 2026
3	Ienergizer	Partial evidence	Noida, IndiaHQ checked Sep 15, 2026	10001+	14,745 contacts →
	Partial evidence “iEnergizer is a leading Business Process Outsourcing provider (“BPO”) of customer management solutions dedicated to delivering performance while actively supporting and advocating…” Source: RevenueBase Database · checked Sep 15, 2026
4	VXI Global Solutions	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 15, 2026	10001+	14,238 contacts →
	Indirect evidence “About VXI Global Solutions VXI Global Solutions is a BPO leader in customer service, customer experience, and digital solutions.” Source: RevenueBase Database · checked Sep 15, 2026
5	Comdata Group	Indirect evidence	Corsico, ItalyHQ checked Sep 15, 2026	10001+	9,614 contacts →
	Indirect evidence “We're KONECTA now!” Source: RevenueBase Database · checked Sep 15, 2026
6	Turkcell Global Bilgi	Indirect evidence	Beyoglu, TürkiyeHQ checked Sep 15, 2026	10001+	6,167 contacts →
	Indirect evidence “Bir Turkcell grup şirketi olarak yılında kurulduğumuzda amacımız hep eşsiz bir müşteri deneyimi yaşatmaktı.” Source: RevenueBase Database · checked Sep 15, 2026
7	Afni, INC	Partial evidence	Bloomington, IL, United StatesHQ checked Sep 15, 2026	10001+	5,553 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 15, 2026
8	Emtelco S.A	Indirect evidence	Medellín, ColombiaHQ checked Sep 15, 2026	10001+	4,998 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 15, 2026
9	Apex America	Indirect evidence	Córdoba, ArgentinaHQ checked Sep 15, 2026	10001+	4,377 contacts →
	Indirect evidence “At Apex America, we are a Next Generation BPO and a global strategic partner specialized in elevating customer service standards.” Source: RevenueBase Database · checked Sep 15, 2026
10	Continuum Global Solutions	Partial evidence	Dallas, TX, United StatesHQ checked Sep 15, 2026	5,001-10,000	4,342 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 15, 2026
11	Ibex. Pakistan	Indirect evidence	Karachi, PakistanHQ checked Sep 15, 2026	10001+	4,161 contacts →
	Indirect evidence “ibex.” Source: RevenueBase Database · checked Sep 15, 2026
12	Callink	Strong evidence	Uberlândia, BrazilHQ checked Sep 15, 2026	5,001-10,000	4,126 contacts →
	Strong evidence “Mais que call center: soluções que transformam o seu negócio e a jornada dos clientes!” Source: RevenueBase Database · checked Sep 15, 2026
13	Raya CX	Indirect evidence	Giza, EgyptHQ checked Sep 15, 2026	5,001-10,000	3,989 contacts →
	Indirect evidence “RAYA Customer Experience provides next-generation BPO and customer experience management on behalf of clients across various industries.” Source: RevenueBase Database · checked Sep 15, 2026
14	Vikstar Contact Center	Partial evidence	Sao Paulo, BrazilHQ checked Sep 15, 2026	10001+	3,914 contacts →
	Partial evidence “Vikstar is one of the biggest contact centers of Brazil.” Source: RevenueBase Database · checked Sep 15, 2026
15	Sercom	Partial evidence	Taboão Da Serra, BrazilHQ checked Sep 15, 2026	5,001-10,000	3,785 contacts →
	Partial evidence “Founded in 1993, since the beginning Sercom has stood out in the Contact Center Services.” Source: RevenueBase Database · checked Sep 15, 2026
16	GSS Global Sales Solutions	Indirect evidence	Madrid, SpainHQ checked Sep 15, 2026	10001+	3,716 contacts →
	Indirect evidence “is a tech company specialized in providing, and for.” Source: RevenueBase Database · checked Sep 15, 2026
17	Merchants	Partial evidence	Johannesburg, South AfricaHQ checked Sep 15, 2026	5,001-10,000	3,654 contacts →
	Partial evidence “Merchants is a leading customer management partner specialising in business process outsourcing (BPO) that delivers customer experience and customer interactions.” Source: RevenueBase Database · checked Sep 15, 2026
18	Teleperformance Global Services	Indirect evidence	Kolkata, IndiaHQ checked Sep 15, 2026	1,001-5,000	3,346 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 15, 2026
19	Quantrics Enterprises INC	Indirect evidence	Taytay, PhilippinesHQ checked Sep 15, 2026	5,001-10,000	3,132 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 15, 2026
20	Telvista	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 15, 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 Sep 15, 2026
21	EPX Eperformax Contact Centers	Partial evidence	Pasay City, PhilippinesHQ checked Sep 15, 2026	5,001-10,000	3,061 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 15, 2026
22	Grupo Contax	Partial evidence	São Paulo, BrazilHQ checked Sep 15, 2026	10001+	2,859 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 15, 2026
23	Advanced Call Center Technologies, LLC	Strong evidence	Berwyn, PA, United StatesHQ checked Sep 15, 2026	5,001-10,000	2,774 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 15, 2026
24	Stream Global Services	Partial evidence	Eagan, MN, United StatesHQ checked Sep 15, 2026	10001+	2,772 contacts →
	Partial evidence “Stream Global Services is a premium business process outsource (BPO) service provider specializing in customer relationship management solutions including sales, customer care…” Source: RevenueBase Database · checked Sep 15, 2026
25	Marketstar	Strong evidence	Ogden, UT, United StatesHQ checked Sep 15, 2026	1,001-5,000	2,446 contacts →
	Strong evidence “MarketStar is a global B2B sales outsourcing leader with 38+ years of experience driving predictable revenue growth.” Source: RevenueBase Database · checked Sep 15, 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: sales outsourcing call centers. 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 sales outsourcing call centers.
Partial evidence: Its own public description names part of sales outsourcing call centers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sales outsourcing call centers. 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 7,616 sales outsourcing call centers worldwide

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Sales outsourcing call centers worldwide at a glance

As of Sep 15, 2026

8.9%Verified-email coverage

56.7Average contacts per company

11-50Median size (employees)

2.4%Largest-city concentration · Lahore

Sep 15, 2026Page data refreshed

Companies by employee count

1-10

1,801

11-50

2,654

51-200

1,784

201-500

699

501-1,000

297

1,001-5,000

268

5,001-10,000

10001+

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 sales outsourcing call centers, 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.
Coverage: 40 countries, largest first: the United States, India, Pakistan, the United Kingdom, the Philippines, France, Germany, Brazil, Canada, Spain and 30 more. Country and city lists for sales outsourcing call centers are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “sales outsourcing call centers”. 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 sales outsourcing call centers), 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 sales outsourcing call centers, and records with no verified work email.
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, 38,498 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 15, 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.

Sales outsourcing call centers by location

49 lists · largest first

Every Sales outsourcing 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 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 sales outsourcing call centers, 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 sales outsourcing call centers are there worldwide?

RevenueBase identified 7,616 sales outsourcing call centers worldwide 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?

Konecta, headquartered in Madrid, tops this list with the largest team on record.

Which country has the most sales outsourcing call centers?

The United States leads with 1,841 companies, followed by India (953) and Pakistan (680). Every sales outsourcing call centers list by country and city is linked on this page.

Which city has the most sales outsourcing call centers?

Lahore leads with 183 headquartered companies, followed by Rawalpindi (145) and London (127).

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 38,498 verified decision-maker contacts tracked across these 7,616 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 15, 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.