Company lists · Data refreshed September 2026

Top 25 Voice outsourcing companies worldwide

Name: Voice outsourcing companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 8,585 companies tracked

RevenueBase identified 8,585 voice outsourcing companies worldwide as of September 2026 and tracks 281,441 professional contacts across them, including 21,665 with verified work emails. The United States is the largest market and Lahore the largest hub.

This list covers voice outsourcing companies 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 29, 2026. Country and city lists for voice outsourcing companies 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 RevenueBase Smart Search rating on every row Refreshed Sep 29, 2026 86% judged on-target in blind review

8,585Companies

281,441Contacts tracked

21,665Verified emails

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The 25 largest voice outsourcing companies worldwide

Ranked by team size

Top 25 of 8,585 voice outsourcing companies worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to voice outsourcing companies: 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	Turkcell Global Bilgi	Indirect evidence	Beyoglu, TürkiyeHQ checked Sep 29, 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 29, 2026
2	Emtelco S.A	Indirect evidence	Medellín, ColombiaHQ checked Sep 29, 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 29, 2026
3	Mindbridge	Indirect evidence	Lahore, PakistanHQ checked Sep 29, 2026	5,001-10,000	4,359 contacts →
	Indirect evidence “Founded in 2004, Mindbridge (Private) Limited is Pakistan’s largest BPO company, operating with a capacity.” Source: RevenueBase Database · checked Sep 29, 2026
4	Continuum Global Solutions	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 29, 2026	5,001-10,000	4,342 contacts →
	Indirect 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 29, 2026
5	Brasil Center Comunicações	Indirect evidence	n/a	5,001-10,000	3,979 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026
6	Vikstar Contact Center	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 29, 2026	10001+	3,914 contacts →
	Indirect evidence “Vikstar is one of the biggest contact centers of Brazil.” Source: RevenueBase Database · checked Sep 29, 2026
7	Sercom	Indirect evidence	Taboão Da Serra, BrazilHQ checked Sep 29, 2026	5,001-10,000	3,785 contacts →
	Indirect evidence “Founded in 1993, since the beginning Sercom has stood out in the Contact Center Services.” Source: RevenueBase Database · checked Sep 29, 2026
8	GSS Global Sales Solutions	Indirect evidence	Madrid, SpainHQ checked Sep 29, 2026	10001+	3,716 contacts →
	Indirect evidence “is a tech company specialized in providing, and for.” Source: RevenueBase Database · checked Sep 29, 2026
9	Telvista	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 29, 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 29, 2026
10	EPX Eperformax Contact Centers	Indirect evidence	Pasay City, PhilippinesHQ checked Sep 29, 2026	5,001-10,000	3,061 contacts →
	Indirect 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 29, 2026
11	Advanced Call Center Technologies, LLC	Indirect evidence	Berwyn, PA, United StatesHQ checked Sep 29, 2026	5,001-10,000	2,774 contacts →
	Indirect 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 29, 2026
12	Stream Global Services	Indirect evidence	Eagan, MN, United StatesHQ checked Sep 29, 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 29, 2026
13	Expert Global Solutions NOW Alorica	Indirect evidence	United StatesHQ checked Sep 29, 2026	10001+	2,388 contacts →
	Indirect evidence “Expert Global Solutions is now part of Alorica.” Source: RevenueBase Database · checked Sep 29, 2026
14	CAT Technologies Argentina	Partial evidence	Buenos Aires, ArgentinaHQ checked Sep 29, 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 29, 2026
15	Vemsertahto	Indirect evidence	Goiania, BrazilHQ checked Sep 29, 2026	5,001-10,000	2,176 contacts →
	Indirect evidence “Somos a Tahto, uma empresa referência em soluções de CX e BPO.” Source: RevenueBase Database · checked Sep 29, 2026
16	Gear INC	Partial evidence	SingaporeHQ checked Sep 29, 2026	5,001-10,000	1,974 contacts →
	Partial evidence “Empowering Global Brands Through Custom BPO Solutions Gear Inc delivers business process outsourcing solutions designed to meet the unique challenges of leading enterprises.” Source: RevenueBase Database · checked Sep 29, 2026
17	Infocision Management Corporation	Indirect evidence	Akron, OH, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,764 contacts →
	Indirect evidence “InfoCision is an award-winning contact center partner trusted by leading brands for over 40 years.” Source: RevenueBase Database · checked Sep 29, 2026
18	Technotask Business Solutions PVT LTD	Indirect evidence	Bhopal, IndiaHQ checked Sep 29, 2026	1,001-5,000	1,762 contacts →
	Indirect evidence “Transforming Customer Experiences Worldwide** At Technotask, we've embarked on a journey of exponential growth and innovation since our inception in March 2020.” Source: RevenueBase Database · checked Sep 29, 2026
19	Km2 Solutions	Partial evidence	Boca Raton, FL, United StatesHQ checked Sep 29, 2026	5,001-10,000	1,741 contacts →
	Partial 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 29, 2026
20	Supportninja	Indirect evidence	Austin, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,711 contacts →
	Indirect evidence “SupportNinja provides customer experience and back-office support services for tech companies and startups around the world.” Source: RevenueBase Database · checked Sep 29, 2026
21	Support Services Group	Indirect evidence	Waco, TX, United StatesHQ checked Sep 29, 2026	5,001-10,000	1,710 contacts →
	Indirect 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 29, 2026
22	Pcci Group	Partial evidence	Dakar, SenegalHQ checked Sep 29, 2026	1,001-5,000	1,702 contacts →
	Partial evidence “Leading Customer Experience and Operations outsourcing provider in emerging markets, PCCI Group has quickly emerged as a key player delivering consistent and branded customer…” Source: RevenueBase Database · checked Sep 29, 2026
23	Sybrid Private Limited	Indirect evidence	Karachi, PakistanHQ checked Sep 29, 2026	1,001-5,000	1,609 contacts →
	Indirect evidence “Sybrid (Pvt) Ltd is Pakistan's leading technology solutions provider, helping businesses optimize their operations and drive growth.” Source: RevenueBase Database · checked Sep 29, 2026
24	RDI Corporation	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,484 contacts →
	Indirect evidence “At RDI, we believe in winning smart by providing customized, strategic solutions to our clients.” Source: RevenueBase Database · checked Sep 29, 2026
25	Datamark, INC	Partial evidence	El Paso, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,418 contacts →
	Partial evidence “DATAMARK Inc, a provider of omni-channel contact centers and business process outsourcing (BPO) services since 1989, employs more than at our facilities in the United States…” Source: RevenueBase Database · checked Sep 29, 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: voice outsourcing companies. 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 voice outsourcing companies.
Partial evidence: Its own public description names part of voice outsourcing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name voice outsourcing companies. 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 8,585 voice outsourcing companies worldwide

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Voice outsourcing companies worldwide at a glance

As of Sep 29, 2026

7.7%Verified-email coverage

32.8Average contacts per company

11-50Median size (employees)

1.7%Largest-city concentration · Lahore

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

2,712

11-50

2,636

51-200

1,875

201-500

700

501-1,000

301

1,001-5,000

265

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 voice outsourcing companies, 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 voice outsourcing companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “voice outsourcing companies”. 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 voice outsourcing companies), 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 voice outsourcing companies, 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, 21,665 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 29, 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.

Voice outsourcing companies by location

38 lists · largest first

Every Voice outsourcing companies 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 voice outsourcing companies, 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 voice outsourcing companies are there worldwide?

RevenueBase identified 8,585 voice outsourcing companies 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?

Turkcell Global Bilgi, headquartered in Beyoglu, tops this list with the largest team on record.

Which country has the most voice outsourcing companies?

The United States leads with 1,728 companies, followed by India (609) and Pakistan (480). Every voice outsourcing companies list by country and city is linked on this page.

Which city has the most voice outsourcing companies?

Lahore leads with 148 headquartered companies, followed by London (142) and Rawalpindi (106).

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 21,665 verified decision-maker contacts tracked across these 8,585 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 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 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.