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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, with clients noting good value for cost. Engagements range from $12,000 to $80,000 annually, with flexible payment options. Clients appreciate the quality of leads generated and the effective communication throughout projects.

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 4.7
  • Cost 4.3
  • Willing to Refer 4.6

Top Mentions

Review Highlights

  • Proficiency in Lead Generation

    Callbox's lead generation services have consistently enabled clients to increase their sales pipeline, generate qualified leads, and set appointments. Clients across various industries have benefited from their ability to connect with decision-makers and convert leads into opportunities.

  • Need for Improved Reporting

    Some clients have noted that Callbox could enhance their reporting capabilities by providing more detailed insights and analysis. This would help clients better understand campaign performance and make informed decisions.

  • Positive Client Relationships

    Callbox fosters strong client relationships through effective communication, understanding client needs, and delivering personalized services. Their professional and courteous demeanor is consistently highlighted by clients.

  • Adaptability and Flexibility

    Callbox is noted for their flexibility in adapting to client needs and processes. They are open to feedback and willing to make adjustments to improve campaign performance, ensuring a tailored approach for each client.

  • Commitment to Client Success

    Clients appreciate Callbox's dedication to achieving business objectives and their proactive approach to overcoming challenges. Their commitment to client success is evident in their willingness to go above and beyond.

  • Strong Project Management

    Clients frequently praise Callbox for their project management skills, highlighting their responsiveness, structured approach, and ability to meet deadlines. Regular communication and weekly meetings ensure transparency and alignment with client goals.

Callbox Reviews

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Introductory Phone Calls for Insurance Resource Firm

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

"Callbox did a great job of discovering who we were and who we needed to connect with."

Feb 8, 2021
Director of Operations, AdvisorServe
Turner Lee
Verified
  • Financial services
  • Woodstock, Georgia
  • 1-10 Employees
  • Online Review
  • Verified

To help an insurance resources firm connect with more prospective clients, Callbox reached out to fee-only financial advisors. They helped set introductory calls via phone, email, and LinkedIn marketing. 

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 Services for Financial Services Company

  • Account-Based Marketing Demand Generation Marketing
  • Confidential
  • Jan. 2026 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

“They bring lots of sales experience to the table.”

Aug 29, 2026
CEO, Maus Software
Aaron Stine
Verified
  • Information technology
  • Land O' Lakes, Florida
  • 1-10 Employees
  • Online Review
  • Verified

Callbox provides lead generation services for a financial services company. The team runs an account-based lead generation program across voice, email, and social media.

Premier Verified means Clutch independently confirmed Callbox is a legally registered business,
financially sound (Creditsafe: Low Risk), and backed by 121 verified client reviews averaging 4.6 stars.

Learn More
Verified Client Reviews
121
Overall Review Rating
4.6
Source
Clutch
Last Updated
August 29, 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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