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Top B2B Lead Generation Experts Worldwide

Since 2004, Callbox has been the trusted leader and top lead generation company, driving high-velocity growth for businesses worldwide. As the largest and most experienced player in B2B sales development, we offer comprehensive solutions from AI-powered prospecting to appointment setting designed to fuel your revenue pipeline.

  • Min project size
    Undisclosed
  • Hourly rate
    Undisclosed
  • Employees
    1,000 - 9,999
  • Locations
    Los Angeles, CA
  • Year founded
    Founded 2004
  • Languages

6 Languages that we service

  • Mandarin
  • English
  • Spanish
  • Portuguese
  • Vietnamese
  • Cantonese

2 Locations

  • Los Angeles , CA
  • Singapore , Singapore

Select Focus Area
Back Office Outsourcing
Customer Service Outsourcing
Outbound Services
Industries
Information technology
20%
Telecommunications
15%
Advertising & marketing
10%
Business services
10%
Financial services
10%
Medical
10%
Education
5%
Hospitality & leisure
5%
Manufacturing
5%
Other industries
5%
Retail
5%
Clients
Enterprise (>$1B)
45%
Midmarket ($10M - $1B)
40%
Small Business (<$10M)
15%
Certified in:
Sales Outsourcing Call Center Services B2B Lead Generation B2B Appointment Setting

Pricing Snapshot

Min. project size Undisclosed
Avg. hourly rate Undisclosed
Rating for cost 4.3 /5

What Clients Have Said

Callbox offers competitive pricing with good value for cost, frequently delivering high-quality leads and appointments. Clients appreciate the flexibility and responsiveness of their team, although some mention a desire for more personalized services and improved reporting. Overall, they are seen as a reliable partner for lead generation.

This summary is based on verified Clutch reviews.

Most Common Project Size

$10,000 - $49,999 based on 100 reviews
< $10,000 $10,000 - $49,999 $50,000 - $199,999 > $200,000

Select a service to see pricing information

Callbox Review Insights

Overall Review Rating

4.6
  • Quality 4.5
  • Schedule 4.6
  • Cost 4.3
  • Willing to Refer 4.6

Top Mentions

Review Highlights

  • Challenges with Non-English Speaking Markets

    Some clients have noted challenges in markets where English is not the primary language, suggesting the need for multilingual support to improve engagement in regions like Vietnam and China.

  • Effective Lead Generation Capabilities

    Callbox has been praised across multiple reviews for its ability to generate qualified leads, often exceeding client expectations in terms of lead volume and quality. Clients in various industries, such as healthcare, IT, and finance, have reported increased sales pipelines and improved conversion rates due to Callbox's lead generation efforts.

  • Successful in Increasing Brand Awareness

    Callbox has successfully helped clients increase brand awareness through targeted outreach and marketing campaigns, contributing to a stronger presence in their respective markets.

  • Strong Project Management and Communication

    Clients commend Callbox for its structured approach to project management and clear communication. Weekly updates and open lines of communication have been highlighted as key strengths, ensuring clients are kept informed and involved in the process.

  • Efficient Workflow and Coordination

    The workflow between Callbox and its clients is often described as efficient and well-coordinated, with teams working seamlessly together to achieve project goals.

  • Comprehensive Multi-Channel Marketing Strategies

    The use of multi-channel marketing strategies, including email, social media, and telemarketing, is a recurring theme in reviews. This approach has been effective in reaching diverse audiences and increasing brand awareness for clients.

Callbox Reviews

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Lead Generation for Economic Development Marketing Agency

  • Call Center Services
  • B2C Telemarketing & telesales
    +1
  • $10,000 to $49,999
  • Aug. 2020 - Ongoing
5.0
Quality
4.5
Schedule
4.5
Cost
4.0
Willing to Refer
4.5

“Whenever we ask for something, they take care of it right away.”

Mar 4, 2021
Partner, CQNS
Chris Hokansson
Verified
  • Advertising & marketing
  • Oakville, Ontario
  • 1-10 Employees
  • Phone Interview
  • Verified

Callbox provides voice services for a marketing agency. They handle appointment setting and lead generation efforts in efforts to reach qualified candidates and qualify them for sales and appointments.

Outbound Sales & Marketing Calls for IT Services Provider

  • Call Center Services
  • $50,000 to $199,999
  • Jan. 2021 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They are extremely organized and methodical."

 
Feb 25, 2021
Vice President, IT-Henhouse
Ann Fields
Verified
  • Other industries
  • Charlotte, North Carolina
  • 1-10 Employees
  • Online Review
  • Verified

Callbox was engaged by a business IT services provider for outbound sales and marketing solutions. The team's main task is to qualified leads and schedule appointments to increase the client's revenue.

B2B Lead Generation & Sales for IT Services Company

  • Advertising
  • $50,000 to $199,999
  • Aug. 2020 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"I found their level of professionalism and dedication to our efforts the most impressive."

Feb 24, 2021
CTO, DV8 Infosystems, Inc
Bill Faruki
Verified
  • Other industries
  • Irvine, California
  • 11-50 Employees
  • Online Review
  • Verified

An IT services company partnered with Callbox to take charge of their B2B lead generation, appointment setting, and initial contact with new prospects.

Call Marketing Services for Industrial Information Provider

  • Call Center Services
  • $10,000 to $49,999
  • Oct. 2020 - Feb. 2021
5.0
Quality
4.5
Schedule
5.0
Cost
4.0
Willing to Refer
5.0

"I was (and still am) very impressed with the ability of the Callbox team to adapt to the needs of clients."

Feb 23, 2021
Managing Director, Industrial Info Resources
Gordon Murray
Verified
  • Business services
  • Japan
  • 501-1,000 Employees
  • Online Review
  • Verified

Callbox was contracted by an industrial information provider for extended marketing support through call center services. The main objective was to boost awareness of the company's services amid the pandemic.

Marketing & Digital Strategy for Economic Dev Marketing Co

  • Advertising Other Digital Marketing
  • $50,000 to $199,999
  • June 2020 - Ongoing
5.0
Quality
4.5
Schedule
5.0
Cost
4.5
Willing to Refer
5.0

“They spent time working with us to build a relationship and understand our business.”

Feb 23, 2021
Partner, CQNS
Bill Elliot
Verified
  • Advertising & marketing
  • Canada
  • 11-50 Employees
  • Phone Interview
  • Verified

Callbox serves as the digital marketing partner to a consultancy firm. They are working on a proactive marketing campaign, identifying target markets and developing content.

Lead Generation Campaign for Video Marketing Company

  • Call Center Services
  • $10,000 to $49,999
  • Oct. - Nov. 2021
5.0
Quality
5.0
Schedule
5.0
Cost
4.5
Willing to Refer
5.0

"They always provide comprehensive and accurate information on leads, which is all that we really want."

Feb 18, 2021
Director, KOR Creative
Steve Wallace
Verified
  • Media
  • Auckland, New Zealand
  • 1-10 Employees
  • Online Review
  • Verified

Callbox provided outbound lead generation services for a video marketing company, helping them reach out to potential clients. The goal was to improve the firm's ROI and develop relationships with clients.

Appointment & Lead Gen for Cloud-based Solutions Provider

  • Call Center Services
  • B2C Telemarketing & telesales
    +1
  • $50,000 to $199,999
  • Jan. 2020 - Ongoing
5.0
Quality
3.5
Schedule
5.0
Cost
1.0
Willing to Refer
4.0

"Callbox has an understanding of what we do, and they’re able to articulate that accurately to our audience."

Feb 17, 2021
Marketing Consulting Head, Instant InfoSystems
Anonymous
Verified
  • Other industries
  • Torrance, California
  • 11-50 Employees
  • Phone Interview
  • Verified

Callbox was hired by a cloud-based solutions provider to generate leads and appointments. Their marketing services include online banner and display ads as well as Google Ads campaigns.

Multi-Touch Point Telemarketing for Big Data & AI Company

  • Call Center Services
  • $50,000 to $199,999
  • July 2020 - Ongoing
4.0
Quality
4.0
Schedule
4.0
Cost
4.5
Willing to Refer
5.0

"Callbox team has the mindset to drive the result."

Feb 15, 2021
Marketing Director, ADVANCE.AI
Long Long
Verified
  • Other industries
  • Singapore
  • 1,001-5,000 Employees
  • Online Review
  • Verified

Callbox provides ongoing multi-touch telemarketing services for a leading big data and AI company. The team generates new leads and sales appointments, handles event RSVP invite, and screens potential leads.

Call Services & Lead Generation for Software Firm

  • Call Center Services Market Research
  • Third party verification
  • $10,000 to $49,999
  • Oct. 2020 - Ongoing
4.0
Quality
4.5
Schedule
5.0
Cost
4.0
Willing to Refer
5.0

“The team offers a different perspective on how you think to improve your sales.”

Feb 12, 2021
Account Manager, Bentley Systems
Leah Kegle
Verified
  • Other industries
  • Exton, Pennsylvania
  • 1,001-5,000 Employees
  • Phone Interview
  • Verified

Callbox provides lead generation services for a tech firm. To drive more sales prospects for a construction solution, they call suitable contacts and pass their notes to an internal member to close the deal. 

Social Media, & Email Marketing & Lead Gen for Telecoms Co

  • Advertising Other Digital Marketing
  • Other advertising
  • $50,000 to $199,999
  • Mar. 2019 - Ongoing
4.0
Quality
4.5
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"Flexibility and proactivity are two of their strengths and key to their competitive advantage."

Feb 12, 2021
Marketing Operations Lead, Telecommunications Company
Paulo Lopez
Verified
  • Telecommunications
  • Miami, Florida
  • 10,001+ Employees
  • Phone Interview
  • Verified

A telecommunications company engaged Callbox to augment lead generation initiatives. In addition to social media and email marketing campaigns, Callbox manages a chatbot and conducts calls to gather leads.

Clutch verification provides an additional layer of data to help you make the right purchasing decision of business services.

Learn More
Verified Client Reviews
112
Overall Review Rating
4.6
Source
Clutch
Last Updated
March 4, 2026

Business Entity

Business Entity Name Callbox, Inc.
Source Delaware Secretary of State
Jurisdiction of Formation Delaware
Date of Formation January 13, 2012
Status Active
Last Updated November 16, 2020
ID 5095306

Credit Report Results

International Credit Risk Assessment Low Risk
Source Creditsafe
Last Updated February 2, 2021
Learn More About The Clutch Verification Process

Locations (2)

4924 Balboa Blvd # 353 Los AngelesCA, United States 91316

2 - 5

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