Company lists · Data refreshed September 2026

Top 25 Outbound calling service providers worldwide

Name: Outbound calling service providers worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 6,376 companies tracked

RevenueBase identified 6,376 outbound calling service providers worldwide as of September 2026 and tracks 92,735 professional contacts across them, including 6,699 with verified work emails. The United States is the largest market and Rawalpindi the largest hub.

This list covers outbound calling service providers 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 calling service providers 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 29, 2026 86% judged on-target in blind review

6,376Companies

92,735Contacts tracked

6,699Verified emails

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The 25 largest outbound calling service providers worldwide

Ranked by team size

Top 25 of 6,376 outbound calling service providers worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to outbound calling service providers: 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	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
2	The Office Gurus	Indirect evidence	St Petersburg, FL, RussiaHQ checked Sep 29, 2026	1,001-5,000	1,198 contacts →
	Indirect 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, 2026
3	crystel.co	Indirect evidence	Amman, JordanHQ checked Sep 29, 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 29, 2026
4	Btcc Call Center	Indirect evidence	Goiânia, BrazilHQ checked Sep 29, 2026	10001+	1,058 contacts →
	Indirect evidence “Em breve uma nova página da BTCC Conexão Cliente.” Source: RevenueBase Database · checked Sep 29, 2026
5	Inktel Contact Center Solutions	Indirect evidence	Doral, FL, United StatesHQ checked Sep 29, 2026	1,001-5,000	902 contacts →
	Indirect 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, 2026
6	Answernet	Indirect evidence	Horsham, PA, United StatesHQ checked Sep 29, 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 29, 2026
7	Talksure	Indirect evidence	Durban, South AfricaHQ checked Sep 29, 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 29, 2026
8	Salebuild	Indirect evidence	Redwood City, CA, United StatesHQ checked Sep 29, 2026	n/a	708 contacts →
	Indirect evidence “Salesify, a leading provider of B2B demand generation services, helps our clients create pipeline and accelerate revenue by identifying, profiling, nurturing and connecting with…” Source: RevenueBase Database · checked Sep 29, 2026
9	Girnar Care	Indirect evidence	Jaipur, IndiaHQ checked Sep 29, 2026	501-1,000	649 contacts →
	Indirect evidence “We at Girnar Care work towards customer satisfaction and it is also a center of customer excellence.” Source: RevenueBase Database · checked Sep 29, 2026
10	Fastco	Indirect evidence	Providencia, ChileHQ checked Sep 29, 2026	1,001-5,000	623 contacts →
	Indirect 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, 2026
11	Telenet Marketing Solutions	Indirect evidence	Athens, GA, IndiaHQ checked Sep 29, 2026	201-500	553 contacts →
	Indirect evidence “From initial market awareness to the final stages of a complex B2B buying journey, modern buyers crave authentic interaction.” Source: RevenueBase Database · checked Sep 29, 2026
12	Saleshive	Indirect evidence	Denver, CO, United StatesHQ checked Sep 29, 2026	51-200	455 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026
13	Supportzebra	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	454 contacts →
	Indirect evidence “SupportZebra is a business process outsourcing company based in the Philippines, with headquarters in the Houston,TX region, that specializes in: Sales & Marketing Retention \|…” Source: RevenueBase Database · checked Sep 29, 2026
14	Proper Business Solutions	Partial evidence	Cairo, EgyptHQ checked Sep 29, 2026	1,001-5,000	447 contacts →
	Partial evidence “Proper Business solutions is offering a comprehensive suite of customer care call center services, outbound and lead generation, back-office and data processing solutions to…” Source: RevenueBase Database · checked Sep 29, 2026
15	UTS Marketing Solutions	Partial evidence	Bandar Kuala Lumpur, MalaysiaHQ checked Sep 29, 2026	1,001-5,000	442 contacts →
	Partial evidence “UTS is one of Malaysia’s leading outsourced contact centre service providers – managing and operating outbound services for several financial institutions.” Source: RevenueBase Database · checked Sep 29, 2026
16	Alliance Pdms	Indirect evidence	Hurst, TX, United StatesHQ checked Sep 29, 2026	51-200	428 contacts →
	Indirect evidence “Alliance is a domestically operated, internationally recognized professional contact center specializing in lead generation and appointment setting.” Source: RevenueBase Database · checked Sep 29, 2026
17	Magellan BPO	Indirect evidence	Mandaluyong City, PhilippinesHQ checked Sep 29, 2026	501-1,000	411 contacts →
	Indirect evidence “Magellan Solutions Outsourcing Inc.” Source: RevenueBase Database · checked Sep 29, 2026
18	Mervice Infotech Pvt. LTD	Partial evidence	Kolkata, IndiaHQ checked Sep 29, 2026	1,001-5,000	395 contacts →
	Partial evidence “As a company with the potential to establish a strong foothold within the BPO domain Mervice promises to go beyond ensuring quality inbound and outbound services.” Source: RevenueBase Database · checked Sep 29, 2026
19	Touchstone Communications	Indirect evidence	Fort Worth, TX, United StatesHQ checked Sep 29, 2026	501-1,000	393 contacts →
	Indirect evidence “Touchstone Communications was built in 2002 on the philosophy of hiring educated, motivated talent and then providing them with the best training and management to achieve our…” Source: RevenueBase Database · checked Sep 29, 2026
20	The Lead Market	Indirect evidence	Nagpur, IndiaHQ checked Sep 29, 2026	51-200	387 contacts →
	Indirect evidence “TLM empowers businesses to generate revenue through their qualified leads.” Source: RevenueBase Database · checked Sep 29, 2026
21	Beyond Codes INC	Indirect evidence	Simi Valley, CA, United StatesHQ checked Sep 29, 2026	201-500	380 contacts →
	Indirect evidence “Beyond Codes is a global B2B lead generation and appointment-setting agency trusted by some of the world's leading technology companies to build enterprise sales pipeline.” Source: RevenueBase Database · checked Sep 29, 2026
22	The Connection Contact Center	Indirect evidence	Bloomington, MN, United StatesHQ checked Sep 29, 2026	1,001-5,000	354 contacts →
	Indirect evidence “For over 35 years, The Connection has made a name for ourselves becoming one of the top industry partners to Fortune 500 companies looking to outsource their contact center…” Source: RevenueBase Database · checked Sep 29, 2026
23	Onbrand24	Partial evidence	Iowa City, United StatesHQ checked Sep 29, 2026	1,001-5,000	346 contacts →
	Partial evidence “As a distinguished global leader in call center outsourcing, OnBrand24 takes pride in its 30-year legacy of delivering exceptional inbound and outbound call center services across…” Source: RevenueBase Database · checked Sep 29, 2026
24	Phoneact	Indirect evidence	Tunis, TunisiaHQ checked Sep 29, 2026	501-1,000	338 contacts →
	Indirect evidence “With more than 900 employees, PhoneAct is an ISO 9001/2008 certified offshore call center service provider.” Source: RevenueBase Database · checked Sep 29, 2026
25	ANT Marketing	Indirect evidence	Sheffield, United KingdomHQ checked Sep 29, 2026	501-1,000	327 contacts →
	Indirect evidence “Skilled talent, proven processes and leading technology.” 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: outbound calling service providers. 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 calling service providers.
Partial evidence: Its own public description names part of outbound calling service providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name outbound calling service providers. 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 6,376 outbound calling service providers worldwide

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Outbound calling service providers worldwide at a glance

As of Sep 29, 2026

7.2%Verified-email coverage

14.5Average contacts per company

11-50Median size (employees)

1.5%Largest-city concentration · Rawalpindi

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

2,341

11-50

2,246

51-200

1,226

201-500

371

501-1,000

106

1,001-5,000

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 calling service providers, 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 calling service providers are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “outbound calling service providers”. 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 calling service providers), 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 calling service providers, 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, 6,699 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 calling service providers by location

26 lists · largest first

Every Outbound calling service providers 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 calling service providers, 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 calling service providers are there worldwide?

RevenueBase identified 6,376 outbound calling service providers 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?

Advanced Call Center Technologies, LLC, headquartered in Berwyn, tops this list with the largest team on record.

Which country has the most outbound calling service providers?

The United States leads with 1,179 companies, followed by India (486) and the United Kingdom (450). Every outbound calling service providers list by country and city is linked on this page.

Which city has the most outbound calling service providers?

Rawalpindi leads with 98 headquartered companies, followed by London (93) and Lahore (83).

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 6,699 verified decision-maker contacts tracked across these 6,376 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.