Company lists · Data refreshed September 2026

Top 25 Customer acquisition call centers worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 7,856 companies tracked

RevenueBase identified 7,856 customer acquisition call centers worldwide as of September 2026 and tracks 191,799 professional contacts across them, including 13,750 with verified work emails. The United States is the largest market and Rawalpindi the largest hub.

This list covers customer acquisition 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 28, 2026. Country and city lists for customer acquisition 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 28, 2026 86% judged on-target in blind review

7,856Companies

191,799Contacts tracked

13,750Verified emails

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The 25 largest customer acquisition call centers worldwide

Ranked by team size

Top 25 of 7,856 customer acquisition call centers worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to customer acquisition 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	IBEX	Strong evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	10001+	15,457 contacts →
	Strong 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 28, 2026
2	Ibex. Pakistan	Indirect evidence	Karachi, PakistanHQ checked Sep 28, 2026	10001+	4,161 contacts →
	Indirect evidence “ibex.” Source: RevenueBase Database · checked Sep 28, 2026
3	Sercom	Partial evidence	Taboão Da Serra, BrazilHQ checked Sep 28, 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 28, 2026
4	Advanced Call Center Technologies, LLC	Strong evidence	Berwyn, PA, United StatesHQ checked Sep 28, 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 28, 2026
5	CAT Technologies Argentina	Strong evidence	Buenos Aires, ArgentinaHQ checked Sep 28, 2026	1,001-5,000	2,221 contacts →
	Strong evidence “Somos la compañía líder en Servicios Next Gen de Contact Center, Business Process Outsourcing (BPO) y Customer Experience (CX).” Source: RevenueBase Database · checked Sep 28, 2026
6	Transcosmos INC	Indirect evidence	Toshima-ku, JapanHQ checked Sep 28, 2026	10001+	1,987 contacts →
	Indirect evidence “transcosmos launched its operations in 1966.” Source: RevenueBase Database · checked Sep 28, 2026
7	Infocision Management Corporation	Partial evidence	Akron, OH, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,764 contacts →
	Partial evidence “InfoCision is an award-winning contact center partner trusted by leading brands for over 40 years.” Source: RevenueBase Database · checked Sep 28, 2026
8	Km2 Solutions	Indirect evidence	Boca Raton, FL, United StatesHQ checked Sep 28, 2026	5,001-10,000	1,741 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 28, 2026
9	Support Services Group	Strong evidence	Waco, TX, United StatesHQ checked Sep 28, 2026	5,001-10,000	1,710 contacts →
	Strong evidence “Support Services Group (SSG) helps businesses accelerate growth and earn customers for life through high-touch, outsourced engagement center services.” Source: RevenueBase Database · checked Sep 28, 2026
10	Full Potential Solutions	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,238 contacts →
	Indirect evidence “Full Potential Solutions (FPS) is a new kind of performance-based outsourcing firm that puts culture and employees first, because we believe that happy, fulfilled teams accomplish…” Source: RevenueBase Database · checked Sep 28, 2026
11	American Call Center	Strong evidence	Guayaquil, EcuadorHQ checked Sep 28, 2026	1,001-5,000	1,225 contacts →
	Strong evidence “We deliver tailored Contact Center and Back Office solutions to our strategic partners, leveraging advanced technology and high quality standards to elevate customer experiences…” Source: RevenueBase Database · checked Sep 28, 2026
12	The Office Gurus	Strong evidence	St Petersburg, FL, RussiaHQ checked Sep 28, 2026	1,001-5,000	1,198 contacts →
	Strong evidence “The Office Gurus (TOG) is a global call center and business process outsource provider of customer care, telemarketing, lead generation, appointment setting, order entry, accounts…” Source: RevenueBase Database · checked Sep 28, 2026
13	Credico	Strong evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	n/a	1,188 contacts →
	Strong evidence “Credico is the world's leading face-to-face customer acquisition agency, helping our clients attract and retain loyal customers.” Source: RevenueBase Database · checked Sep 28, 2026
14	Ventas Y Servicios S.A	Partial evidence	Bogotá D.c., ColombiaHQ checked Sep 28, 2026	1,001-5,000	1,116 contacts →
	Partial evidence “MISIÓN Somos una compañía de Contact Center y tercerización de procesos (Business Process Outsourcing BPO), rentable, con presencia nacional; que brinda soluciones ágiles y…” Source: RevenueBase Database · checked Sep 28, 2026
15	Hrhnext Services Limited	Partial evidence	Hyderabad, IndiaHQ checked Sep 28, 2026	1,001-5,000	1,076 contacts →
	Partial evidence “Even the markets know that we’re the good call’!” Source: RevenueBase Database · checked Sep 28, 2026
16	Btcc Call Center	Indirect evidence	Goiânia, BrazilHQ checked Sep 28, 2026	10001+	1,058 contacts →
	Indirect evidence “Em breve uma nova página da BTCC Conexão Cliente.” Source: RevenueBase Database · checked Sep 28, 2026
17	B2s Business Support Services	Indirect evidence	Gennevilliers Cedex, FranceHQ checked Sep 28, 2026	10001+	978 contacts →
	Indirect evidence “Expert de la relation client depuis 1996, b2s est le N°1 de l’externalisation de votre relation client en qualité délivrée.” Source: RevenueBase Database · checked Sep 28, 2026
18	Inktel Contact Center Solutions	Strong evidence	Doral, FL, United StatesHQ checked Sep 28, 2026	1,001-5,000	902 contacts →
	Strong evidence “Our Company Inktel is a leading business process outsourcer that specializes in creating personalized call center solutions which enable our clients to increase market share…” Source: RevenueBase Database · checked Sep 28, 2026
19	Answernet	Indirect evidence	Horsham, PA, United StatesHQ checked Sep 28, 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 Sep 28, 2026
20	Focus Services	Indirect evidence	Roy, UT, United StatesHQ checked Sep 28, 2026	1,001-5,000	792 contacts →
	Indirect evidence “Focus was founded in 1995.” Source: RevenueBase Database · checked Sep 28, 2026
21	Talksure	Indirect evidence	Durban, South AfricaHQ checked Sep 28, 2026	501-1,000	718 contacts →
	Indirect evidence “Established in 2010, Talksure has developed a reputation for being a respected financial services provider and outsource business services partner.” Source: RevenueBase Database · checked Sep 28, 2026
22	Vector	Partial evidence	Fortaleza, BrazilHQ checked Sep 28, 2026	1,001-5,000	701 contacts →
	Partial evidence “A VECTOR SERVIÇOS é uma empresa especializada na criação, implantação e gestão de serviços de Contact Center.” Source: RevenueBase Database · checked Sep 28, 2026
23	Wengage	Partial evidence	Diegem, BelgiumHQ checked Sep 28, 2026	1,001-5,000	682 contacts →
	Partial evidence “WEngage creates the best and authentic customer experiences driven by skilled employees, cutting-edge technology and certified working procedures.” Source: RevenueBase Database · checked Sep 28, 2026
24	Girnar Care	Strong evidence	Jaipur, IndiaHQ checked Sep 28, 2026	501-1,000	649 contacts →
	Strong evidence “We at Girnar Care work towards customer satisfaction and it is also a center of customer excellence.” Source: RevenueBase Database · checked Sep 28, 2026
25	Fastco	Partial evidence	Providencia, ChileHQ checked Sep 28, 2026	1,001-5,000	623 contacts →
	Partial evidence “Impulsamos el éxito de nuestros clientes a través de soluciones personalizadas en Contact Center y experiencia al cliente.” Source: RevenueBase Database · checked Sep 28, 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: customer acquisition 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 customer acquisition call centers.
Partial evidence: Its own public description names part of customer acquisition call centers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name customer acquisition 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 7,856 customer acquisition call centers worldwide

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Customer acquisition call centers worldwide at a glance

As of Sep 28, 2026

7.2%Verified-email coverage

24.4Average contacts per company

11-50Median size (employees)

1.5%Largest-city concentration · Rawalpindi

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

2,377

11-50

2,884

51-200

1,650

201-500

533

501-1,000

203

1,001-5,000

154

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 customer acquisition 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: Every country. Country and city lists for customer acquisition call centers are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “customer acquisition 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 customer acquisition 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 customer acquisition 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, 13,750 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 28, 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.

Customer acquisition call centers by location

30 lists · largest first

Every Customer acquisition 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 customer acquisition 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 customer acquisition call centers are there worldwide?

RevenueBase identified 7,856 customer acquisition 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?

IBEX, headquartered in Washington, tops this list with the largest team on record.

Which country has the most customer acquisition call centers?

The United States leads with 1,716 companies, followed by India (550) and the United Kingdom (522). Every customer acquisition call centers list by country and city is linked on this page.

Which city has the most customer acquisition call centers?

Rawalpindi leads with 119 headquartered companies, followed by London (117) and Pune (98).

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 13,750 verified decision-maker contacts tracked across these 7,856 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 28, 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.