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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 for lead generation services, often highlighted for delivering high-quality leads and appointments. Clients report satisfaction with value for cost, with investments ranging from $12,000 to over $80,000 annually, depending on service scope and engagement length.

This summary is based on verified Clutch reviews.

Most Common Project Size

$10,000 - $49,999 based on 101 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

  • High Quality of Customer Service

    Callbox is praised for their excellent customer service, with teams being responsive, courteous, and committed to client success. Their ability to maintain open lines of communication and address issues promptly is a notable strength.

  • Customization and Flexibility

    Clients appreciate Callbox's willingness to adapt to specific business needs and provide tailored solutions. Their flexibility in adjusting strategies and processes to align with client goals is a significant advantage.

  • Effective Lead Generation and Appointment Setting

    Callbox effectively generates leads and sets appointments, contributing to the growth of various businesses. Clients report increased sales pipelines and successful engagements with qualified leads, showcasing Callbox's ability to boost business development efforts.

  • Challenges with Non-English Markets

    Some clients note that Callbox could improve their services by offering support in languages other than English, as this would enhance their effectiveness in non-English speaking regions like Vietnam and China.

  • Proficiency in Multi-Channel Marketing

    Callbox utilizes a mix of outbound calling, email, social media, and digital marketing to reach target audiences. This multi-channel approach helps clients increase brand awareness and engage with a broader audience effectively.

  • Successful Campaign Adjustments and Strategy Refinement

    Callbox is proactive in refining strategies and making necessary adjustments to improve campaign performance. Clients appreciate their commitment to continuous improvement and achieving better results.

Callbox Reviews

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B2B Appointment Setting Services for Finance Company

  • Call Center Services
  • $10,000 to $49,999
  • Nov. 2019 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They are very professional and responsive."

Feb 7, 2021
CEO, ProbateCash
Robin Shapiro
Verified
  • Financial services
  • West Palm Beach, Florida
  • 11-50 Employees
  • Online Review
  • Verified

Callbox provides B2B appointment setting services for a finance firm. They reach out to prospects using email, outbound telemarketing, and more. Then, they set up appointments with the client's internal staff.

Lead Generation Call Center Svcs for Medical Device Company

  • Call Center Services
  • $10,000 to $49,999
  • May 2021 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They have an excellent workflow."

Feb 5, 2021
President & Founder, ARC Medical, Inc.
Hal Norris
Verified
  • Other industries
  • Tucker, Georgia
  • 1-10 Employees
  • Online Review
  • Verified

Callbox provides call center services to a medical device company in order to enhance their lead generation efforts. The team reaches out to potential customers and sets up Zoom meetings with the client's reps.

Marketing & Telemarketing for Healthcare Software Company

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

"The workflow between our two companies was fantastic."

Feb 5, 2021
Director of Sales, VOW
Dan Wehrle
Verified
  • Other industries
  • Pittsburgh, Pennsylvania
  • 51-200 Employees
  • Online Review
  • Verified

Callbox provides marketing and telemarketing services for a healthcare software company. The team works to promote the client's services via a website as well as through telemarketing campaigns.

Lead Generation for Custom & Strategic Software Dev Firm

  • Market Research
  • $10,000 to $49,999
  • Sep. 2020 - Ongoing
4.5
Quality
4.0
Schedule
5.0
Cost
4.5
Willing to Refer
5.0

“They’re dedicated to learning about our business and have worked hard to educate themselves.”

Feb 4, 2021
Client & Strategy Development, LUX interactive, LLC
Brianne Ray
Verified
  • Other industries
  • Troy, Michigan
  • 11-50 Employees
  • Phone Interview
  • Verified

Callbox calls potential buyers, messages them on LinkedIn, and sends email marketing campaigns to a target audience. Then they qualify leads, schedule appointments, and provide a summary report.

Outreach for Telehealth & Telemedicine Payment Platform

  • Advertising Pay Per Click Social Media Marketing
  • LinkedIn Advertising
  • Confidential
  • Oct. 2020 - Ongoing
4.5
Quality
5.0
Schedule
4.0
Cost
5.0
Willing to Refer
5.0

“Once their team understood our business, they increased the number of appointments booked by 400%.”

Feb 4, 2021
Owner, Capital Bankcard Option
Dan Clark
Verified
  • Financial services
  • Newport Beach, California
  • 1-10 Employees
  • Phone Interview
  • Verified

Callbox generates leads for their clients by conducting outreach, qualifying potential buyers, and setting up appointments. They also support PPC and social media marketing efforts.

Sales BPO for Medical Supply Seller

  • B2B Appointment Setting B2B Lead Generation B2B Lead Qualification
  • $10,000 to $49,999
  • June 2017 - June 2018
4.5
Quality
4.5
Schedule
5.0
Cost
5.0
Willing to Refer
4.5

"Callbox has a desire to satisfy their customers’ needs."

Feb 2, 2021
Former VP of Sales, Pulsecheck
Carl Schneider
Verified
  • Other industries
  • Brentwood, Tennessee
  • 11-50 Employees
  • Phone Interview
  • Verified

Callbox provided call services to an emergency department software company. The team reached out to specified names using a prepared script in order to secure new accounts.

Marketing & Lead Gen Strategies for Business Consulting Firm

  • Business Consulting Call Center Services
  • Strategy Development Consulting Marketing Operations Consulting
  • $10,000 to $49,999
  • Oct. 2020 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
3.0
Willing to Refer
5.0

"Their quality assurance team is dedicated to meeting our qualified lead generation goals."

Feb 1, 2021
Owner, Strategy Leaders
Andi Gray
Verified
  • Other industries
  • Norwalk, Connecticut
  • 1-10 Employees
  • Phone Interview
  • Verified

Callbox developed a lead generation strategy that the team executes. They collect lead information and then call prospects to spur leads. They manage Google Ads and LinkedIn accounts as well as a chatbot.

Outbound Voice Services for Bank Security Company

  • Call Center Services
  • B2C Telemarketing & telesales
  • Confidential
  • Sep. 2018 - Ongoing
4.0
Quality
4.0
Schedule
4.5
Cost
4.0
Willing to Refer
4.5

"Overall, we’re pleased with the results gleaned from their efforts."

Apr 18, 2019
Director of Marketing, Bank Security Company
Anonymous
Verified
  • Financial services
  • Connecticut, United States
  • 201-500 Employees
  • Phone Interview
  • Verified

Callbox provides outbound voice services for a bank security company. They are responsible for developing scripts, contacting existing and potential clients, and responding to customer challenges.

Lead Generation for Telecommunications Company

  • Demand Generation Marketing
  • Confidential
  • Jan. 2021 - Ongoing
4.5
Quality
4.5
Schedule
4.5
Cost
4.0
Willing to Refer
3.0

"I'm impressed with Callbox's dedication to quality lead generation and follow-through."

Aug 22, 2026
Manager, The Maynard Group
David Atkinson-Smith
Verified
  • Telecommunications
  • Soquel, California
  • 51-200 Employees
  • Online Review
  • Verified

Callbox provides lead generation services for a telecommunications company. The team delivers a list of qualified leads and sets appointments.

Content Marketing & Marketing Strategy for ISO Consultancy

  • Content Marketing Marketing Strategy
  • Confidential
  • Aug. 2026 - Ongoing
4.0
Quality
4.0
Schedule
5.0
Cost
4.0
Willing to Refer
4.0

"We've had a great experience with Callbox so far."

Aug 21, 2026
Head of Sales & Marketing, ISO Consultancy
Anonymous
Verified
  • Business services
  • Stockport, England
  • 1-10 Employees
  • Online Review
  • Verified

Callbox provides marketing strategy and content marketing services for an ISO consultancy. The team is responsible for improving the client's website authority score and generating leads.

Premier Verified means Clutch independently confirmed Callbox is a legally registered business,
financially sound (Creditsafe: Low Risk), and backed by 117 verified client reviews averaging 4.6 stars.

Learn More
Verified Client Reviews
117
Overall Review Rating
4.6
Source
Clutch
Last Updated
August 24, 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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