Company lists · Data refreshed September 2026

Top 25 Outbound call centers services worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 8,372 companies tracked

RevenueBase identified 8,372 outbound call centers services worldwide as of September 2026 and tracks 212,408 professional contacts across them, including 13,094 with verified work emails. The United States is the largest market and Lahore the largest hub.

This list covers outbound call centers services 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 27, 2026. Country and city lists for outbound call centers services 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 27, 2026 86% judged on-target in blind review

8,372Companies

212,408Contacts tracked

13,094Verified emails

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The 25 largest outbound call centers services worldwide

Ranked by team size

Top 25 of 8,372 outbound call centers services worldwide, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to outbound call centers services: 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	Telvista	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 27, 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 27, 2026
2	EPX Eperformax Contact Centers	Partial evidence	Pasay City, PhilippinesHQ checked Sep 27, 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 27, 2026
3	Advanced Call Center Technologies, LLC	Strong evidence	Berwyn, PA, United StatesHQ checked Sep 27, 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 27, 2026
4	Stream Global Services	Indirect evidence	Eagan, MN, United StatesHQ checked Sep 27, 2026	10001+	2,772 contacts →
	Indirect 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 27, 2026
5	Nexa BPO	Partial evidence	Bogotá D.c, ColombiaHQ checked Sep 27, 2026	5,001-10,000	2,342 contacts →
	Partial evidence “Más que un contact center y BPO, somos el partner que asegura que la experiencia de tus clientes sea increíble.” Source: RevenueBase Database · checked Sep 27, 2026
6	CAT Technologies Argentina	Partial evidence	Buenos Aires, ArgentinaHQ checked Sep 27, 2026	1,001-5,000	2,221 contacts →
	Partial 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 27, 2026
7	Allied Global	Indirect evidence	GuatemalaHQ checked Sep 27, 2026	5,001-10,000	1,979 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 27, 2026
8	Infocision Management Corporation	Partial evidence	Akron, OH, United StatesHQ checked Sep 27, 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 27, 2026
9	Km2 Solutions	Indirect evidence	Boca Raton, FL, United StatesHQ checked Sep 27, 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 27, 2026
10	Support Services Group	Partial evidence	Waco, TX, United StatesHQ checked Sep 27, 2026	5,001-10,000	1,710 contacts →
	Partial 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 27, 2026
11	Itelcx	Indirect evidence	Vieux Fort, JamaicaHQ checked Sep 27, 2026	1,001-5,000	1,354 contacts →
	Indirect evidence “itel is the Caribbean’s largest homegrown, award-winning customer experience (CX) partner, with operations across the Caribbean and Latin America.” Source: RevenueBase Database · checked Sep 27, 2026
12	American Call Center	Partial evidence	Guayaquil, EcuadorHQ checked Sep 27, 2026	1,001-5,000	1,225 contacts →
	Partial 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 27, 2026
13	The Office Gurus	Strong evidence	St Petersburg, FL, RussiaHQ checked Sep 27, 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 27, 2026
14	crystel.co	Indirect evidence	Amman, JordanHQ checked Sep 27, 2026	1,001-5,000	1,128 contacts →
	Indirect evidence “Crystel emerged as a leading Outsourcing Service Provider (OSP) since its establishment in Jordan in early 2007.” Source: RevenueBase Database · checked Sep 27, 2026
15	Hrhnext Services Limited	Partial evidence	Hyderabad, IndiaHQ checked Sep 27, 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 27, 2026
16	Btcc Call Center	Indirect evidence	Goiânia, BrazilHQ checked Sep 27, 2026	10001+	1,058 contacts →
	Indirect evidence “Em breve uma nova página da BTCC Conexão Cliente.” Source: RevenueBase Database · checked Sep 27, 2026
17	B2s Business Support Services	Indirect evidence	Gennevilliers Cedex, FranceHQ checked Sep 27, 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 27, 2026
18	Transparent BPO	Partial evidence	Rockville, MD, United StatesHQ checked Sep 27, 2026	1,001-5,000	972 contacts →
	Partial evidence “Transparent BPO was founded to provide its clients with superior nearshore contact center services and business process outsourcing at competitive pricing.” Source: RevenueBase Database · checked Sep 27, 2026
19	Youtility Center DO Brasil	Partial evidence	Barra Mansa, BrazilHQ checked Sep 27, 2026	1,001-5,000	926 contacts →
	Partial evidence “A Youtility Center do Brasil faz parte do “Gruppo Distribuzione Spa”, com sede na Itália desde 1998.” Source: RevenueBase Database · checked Sep 27, 2026
20	Inktel Contact Center Solutions	Strong evidence	Doral, FL, United StatesHQ checked Sep 27, 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 27, 2026
21	Answernet	Indirect evidence	Horsham, PA, United StatesHQ checked Sep 27, 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 27, 2026
22	CBE Companies	Indirect evidence	Cedar Falls, IA, United StatesHQ checked Sep 27, 2026	1,001-5,000	877 contacts →
	Indirect evidence “CBE Companies is the parent organization of CBE Customer Solutions and CBE Group.” Source: RevenueBase Database · checked Sep 27, 2026
23	Intarvo Technologies Pvt. Limited	Indirect evidence	Noida, IndiaHQ checked Sep 27, 2026	1,001-5,000	863 contacts →
	Indirect evidence “inTarvo stands for our core ideology of Delivering Value (inT+arvo=Integration + Value).” Source: RevenueBase Database · checked Sep 27, 2026
24	Voicenter Paraguay	Indirect evidence	Asunción, ParaguayHQ checked Sep 27, 2026	1,001-5,000	760 contacts →
	Indirect evidence “Somos una compañía líder en Business Process Outsourcing, con foco en el Customer Experience Digital a través de la innovación y la identificación de nuevas herramientas para…” Source: RevenueBase Database · checked Sep 27, 2026
25	Talksure	Indirect evidence	Durban, South AfricaHQ checked Sep 27, 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 27, 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: outbound call centers services. 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 outbound call centers services.
Partial evidence: Its own public description names part of outbound call centers services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name outbound call centers services. 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 8,372 outbound call centers services worldwide

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Outbound call centers services worldwide at a glance

As of Sep 27, 2026

6.2%Verified-email coverage

25.4Average contacts per company

11-50Median size (employees)

1.8%Largest-city concentration · Lahore

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

2,032

11-50

2,928

51-200

2,061

201-500

745

501-1,000

299

1,001-5,000

224

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 outbound call centers services, 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 outbound call centers services are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “outbound call centers services”. 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 outbound call centers services), 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 outbound call centers services, 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, 13,094 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 27, 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.

Outbound call centers services by location

30 lists · largest first

Every Outbound call centers services 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 outbound call centers services, 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 outbound call centers services are there worldwide?

RevenueBase identified 8,372 outbound call centers services 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?

Telvista, headquartered in Dallas, tops this list with the largest team on record.

Which country has the most outbound call centers services?

The United States leads with 1,424 companies, followed by India (709) and Pakistan (582). Every outbound call centers services list by country and city is linked on this page.

Which city has the most outbound call centers services?

Lahore leads with 147 headquartered companies, followed by Rawalpindi (142) and London (99).

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 13,094 verified decision-maker contacts tracked across these 8,372 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 27, 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.