Company lists · Data refreshed September 2026
Top 25 Outbound call center services worldwide
RevenueBase identified 7,600 outbound call center services worldwide as of September 2026 and tracks 171,156 professional contacts across them, including 10,989 with verified work emails. The United States is the largest market and Rawalpindi the largest hub.
This list covers outbound call center 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 29, 2026. Country and city lists for outbound call center 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.
The 25 largest outbound call center services worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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, 2026Thanks. The Data Team will review it. | |||||
| 4 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 1,076 contacts → | ||||
Partial evidence “Even the markets know that we’re the good call’!” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 1,058 contacts → | ||||
Indirect evidence “Em breve uma nova página da BTCC Conexão Cliente.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 1,047 contacts → | ||||
Indirect evidence “Bill Gosling Outsourcing India Private Limited (Formerly MattsenKumar).” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 877 contacts → | ||||
Indirect evidence “CBE Companies is the parent organization of CBE Customer Solutions and CBE Group.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 649 contacts → | ||||
Partial evidence “We at Girnar Care work towards customer satisfaction and it is also a center of customer excellence.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 572 contacts → | ||||
Partial evidence “Empresa dedicada a prestar servicios de Contact Center a terceros.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 542 contacts → | ||||
Indirect evidence “We are customer service experts.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
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 center 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 center services.
- Partial evidence
- Its own public description names part of outbound call center 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 center 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 7,600 outbound call center services worldwide
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Outbound call center services worldwide at a glance
As of Sep 29, 2026Companies by employee count
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 center 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 center services are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “outbound call center 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 center 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 center 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, 10,989 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.
Outbound call center services by location
27 lists · largest firstEvery Outbound call center services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Outbound call center services based in the United States1,311
- Outbound call center services based in India622
- Outbound call center services based in the United Kingdom443
- Outbound call center services based in the Philippines264
- Outbound call center services based in Germany206
- Outbound call center services based in France185
- Outbound call center services based in Canada162
- Outbound call center services based in Italy161
- Outbound call center services based in the Netherlands153
- Outbound call center services based in Brazil118
- Outbound call center services based in Spain105
- Outbound call center services based in Australia85
- Outbound call center services based in Egypt84
- Outbound call center services based in Mexico84
- Outbound call center services based in South Africa72
- Outbound call center services based in Türkiye66
- Outbound call center services based in Colombia57
- Outbound call center services based in Argentina54
- Outbound call center services based in Denmark44
- Outbound call center services based in Poland43
- Outbound call center services based in Sweden43
- Outbound call center services based in Belgium39
Cities
- Outbound call center services based in London, United Kingdom90
- Outbound call center services based in Noida, India45
- Outbound call center services based in New York, United States40
- Outbound call center services based in Houston, United States37
- Outbound call center services based in Paris, France33
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 center 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 center services are there worldwide?
RevenueBase identified 7,600 outbound call center 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?
Sercom, headquartered in Taboao Da Serra, tops this list with the largest team on record.
Which country has the most outbound call center services?
The United States leads with 1,311 companies, followed by India (622) and the United Kingdom (443). Every outbound call center services list by country and city is linked on this page.
Which city has the most outbound call center services?
Rawalpindi leads with 126 headquartered companies, followed by Lahore (115) and London (92).
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 10,989 verified decision-maker contacts tracked across these 7,600 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.