Company lists · Data refreshed September 2026

Top 25 Inbound appointment setting call centers based in the United States

Name: Inbound appointment setting call centers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 15, 2026 1,061 companies tracked

RevenueBase identified 1,061 inbound appointment setting call centers headquartered in the United States as of September 2026 and tracks 38,587 professional contacts across them, including 3,739 with verified work emails. New York is the largest hub.

This list covers inbound appointment setting call centers headquartered in the United States, 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 15, 2026.

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 15, 2026 86% judged on-target in blind review

1,061Companies

38,587Contacts tracked

3,739Verified emails

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The 25 largest inbound appointment setting call centers based in the United States

Ranked by team size

Top 25 of 1,061 inbound appointment setting call centers based in the United States, ranked by team size, largest first. Data refreshed Sep 15, 2026. RevenueBase Smart Search rates how each company's information relates to inbound appointment setting 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	Advanced Call Center Technologies, LLC	Strong evidence	Berwyn, PA, United StatesHQ checked Sep 15, 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 15, 2026
2	Liveops, INC	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 15, 2026	n/a	2,026 contacts →
	Indirect evidence “Human-Led, Tech-Powered Customer Service For over 25 years, Liveops has redefined customer support by combining technology with real human connection.” Source: RevenueBase Database · checked Sep 15, 2026
3	Infocision Management Corporation	Partial evidence	Akron, OH, United StatesHQ checked Sep 15, 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 15, 2026
4	Km2 Solutions	Indirect evidence	Boca Raton, FL, United StatesHQ checked Sep 15, 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 15, 2026
5	Support Services Group	Partial evidence	Waco, TX, United StatesHQ checked Sep 15, 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 15, 2026
6	Inktel Contact Center Solutions	Strong evidence	Doral, FL, United StatesHQ checked Sep 15, 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 15, 2026
7	Answernet	Indirect evidence	Horsham, PA, United StatesHQ checked Sep 15, 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 15, 2026
8	Global Contact Services GCS	Indirect evidence	Salisbury, NC, United StatesHQ checked Sep 15, 2026	501-1,000	542 contacts →
	Indirect evidence “We are customer service experts.” Source: RevenueBase Database · checked Sep 15, 2026
9	Supportzebra	Indirect evidence	Houston, TX, United StatesHQ checked Sep 15, 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 15, 2026
10	RUBY	Indirect evidence	Portland, OR, United StatesHQ checked Sep 15, 2026	501-1,000	453 contacts →
	Indirect evidence “Ruby supports more than businesses with live virtual receptionists and 24/7 chat services.” Source: RevenueBase Database · checked Sep 15, 2026
11	Ansafone Contact Centers	Partial evidence	Santa Ana, CA, United StatesHQ checked Sep 15, 2026	501-1,000	431 contacts →
	Partial evidence “About : Ansafone is the leading outsourced contact center solution provider for companies in the US and Canada and maintains international alliances for global reach.” Source: RevenueBase Database · checked Sep 15, 2026
12	Alliance Pdms	Strong evidence	Hurst, TX, United StatesHQ checked Sep 15, 2026	51-200	428 contacts →
	Strong evidence “Alliance is a domestically operated, internationally recognized professional contact center specializing in lead generation and appointment setting.” Source: RevenueBase Database · checked Sep 15, 2026
13	Touchstone Communications	Indirect evidence	Fort Worth, TX, United StatesHQ checked Sep 15, 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 15, 2026
14	Beyond Codes INC	Strong evidence	Simi Valley, CA, United StatesHQ checked Sep 15, 2026	201-500	380 contacts →
	Strong 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 15, 2026
15	Connexus Resource Group	Indirect evidence	Bainbridge Island, United StatesHQ checked Sep 15, 2026	201-500	373 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 15, 2026
16	The Connection Contact Center	Partial evidence	Bloomington, MN, United StatesHQ checked Sep 15, 2026	1,001-5,000	354 contacts →
	Partial 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 15, 2026
17	Teledirect Call Centers	Strong evidence	Sacramento, CA, United StatesHQ checked Sep 15, 2026	201-500	307 contacts →
	Strong evidence “TeleDirect provides 24/7 U.S-based call center and answering services for organizations that cannot afford to miss important calls.” Source: RevenueBase Database · checked Sep 15, 2026
18	smith.ai	Partial evidence	Los Altos, CA, United StatesHQ checked Sep 15, 2026	51-200	293 contacts →
	Partial evidence “Founded by a team from Google, Apple, and Intuit, Smith.ai is known for superior call answering services.” Source: RevenueBase Database · checked Sep 15, 2026
19	By Appointment Only, Inc. BAO	Strong evidence	Chelmsford, MA, United StatesHQ checked Sep 15, 2026	201-500	291 contacts →
	Strong evidence “The market knows us as the leader in appointment setting.” Source: RevenueBase Database · checked Sep 15, 2026
20	Calltend INC	Indirect evidence	Los Angeles, TX, United StatesHQ checked Sep 15, 2026	51-200	289 contacts →
	Indirect evidence “Current Vertical Focus: Real Estate - Lead Generation, Lead Conversion, Lead Qualification, Agent Recruiting Mortgage - Lead Conversion, Lead Qualification Insurance - Lead…” Source: RevenueBase Database · checked Sep 15, 2026
21	Boomsourcing	Strong evidence	Lehi, UT, United StatesHQ checked Sep 15, 2026	501-1,000	256 contacts →
	Strong evidence “Boomsourcing (A Fusion CX Company) is a call center established in 2007.” Source: RevenueBase Database · checked Sep 15, 2026
22	Rocket Connections	Partial evidence	Detroit, MI, United StatesHQ checked Sep 15, 2026	1,001-5,000	247 contacts →
	Partial evidence “Rocket Connections is a sales and support platform specializing in contact center services.” Source: RevenueBase Database · checked Sep 15, 2026
23	Anomaly Squared	Partial evidence	Greensboro, NC, United StatesHQ checked Sep 15, 2026	201-500	216 contacts →
	Partial evidence “Schedule your FREE Consultation here: http://bit.ly/2gUckQb Anomaly Squared is a contact center services provider.” Source: RevenueBase Database · checked Sep 15, 2026
24	Belkins INC	Strong evidence	Dover, DE, United StatesHQ checked Sep 15, 2026	201-500	209 contacts →
	Strong evidence “Belkins is the #1 ranked appointment-setting agency in the USA for 5 years in a row, driving results for businesses in 50+ industries across the globe.” Source: RevenueBase Database · checked Sep 15, 2026
25	Ceequence Technologies PVT LTD	Strong evidence	Parsipany, NJ, United StatesHQ checked Sep 15, 2026	201-500	199 contacts →
	Strong evidence “Ceequence is an ISO 27001 company that operates a 250-seat call center in Chennai, India, with state-of-the-art technology and experienced customer service professionals for…” Source: RevenueBase Database · checked Sep 15, 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: inbound appointment setting 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 inbound appointment setting call centers.
Partial evidence: Its own public description names part of inbound appointment setting call centers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name inbound appointment setting 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 1,061 inbound appointment setting call centers based in the United States

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Inbound appointment setting call centers based in the United States at a glance

As of Sep 15, 2026

9.7%Verified-email coverage

36.4Average contacts per company

11-50Median size (employees)

3.0%Largest-city concentration · New York

Sep 15, 2026Page data refreshed

Companies by employee count

1-10

282

11-50

352

51-200

256

201-500

101

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,061 companies.

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 inbound appointment setting 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “inbound appointment setting 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 inbound appointment setting 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 inbound appointment setting call centers, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 3,739 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 15, 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.

Inbound appointment setting call centers by metro

Inbound appointment setting call centers in New York32
Inbound appointment setting call centers in Los Angeles29
Inbound appointment setting call centers in Miami25

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 inbound appointment setting 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 inbound appointment setting call centers are there based in the United States?

RevenueBase identified 1,061 inbound appointment setting call centers headquartered in the United States 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 city has the most inbound appointment setting call centers?

New York leads with 32 headquartered companies, followed by Los Angeles (29) and Miami (25).

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 3,739 verified decision-maker contacts tracked across these 1,061 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 15, 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.