
Callbox
ReviewThe largest provider of outsourced B2B marketing and sales support

Clients
About Callbox
Global B2B lead generation company founded in 2004, delivering 1.3M+ qualified leads across 20,000+ campaigns. Combines AI-powered tools with human expertise for multi-channel outreach including phone, email, LinkedIn, chat, and events across 15+ languages.
Who Callbox Is Best For
Global B2B companies needing multi-channel, multilingual lead generation.
Why Choose Callbox
Callbox Services
Selected Work
Callbox Generates Quality Leads for a Denver Security PaaS Firm
Security PaaS firm (Denver)
The Client is a Denver-based security Platform-as-a-Service provider offering cloud-native threat monitoring and compliance tools. It serves mid-market and enterprise organisations across North America.
View case studyABM Lead Generation: Generate Quality SQLs for Colombian Telehealth Firm
Telehealth firm (Bogotá)
The Client is a telehealth startup headquartered in Bogotá, Colombia, operating a chat-first and video telemedicine platform. It connects patients with specialist doctors across Latin America via mobile, offering digital consultations, prescriptions, and corporate wellness integration.
View case studyGlobal Semiconductor Leader Secures Registrants for a Major Manufacturing Event
Semiconductor manufacturer
A global semiconductor and embedded processing solutions provider serving the automotive, industrial, and connected industries, operating in over 30 countries.
View case studyReviews from Google
Spam. Had a couple calls with them and then informed them our company would not be interested, but i receive constant emails from Vincent with a copy/paste email. This isn't professional and comes across as spam. Take a hint.
Had two Exploratory Meetings scheduled with a Callbox representative, but they were no-shows (Jan 21 and Feb 3). I waited in the Zoom meeting room, but nobody showed up to let me in. Their service might be fine, too bad I never had the opportunity to even speak with somebody!
Reviews sourced from Google
See all 48 reviews on GooglePhotos




Alternatives to Callbox
Lead Gen Agencies with a similar market, price band, and focus.

Leadium
★ 9.6High-growth startups seeking scalable sales development
$1B+ revenue pipeline created across 1200 organizations

CIENCE Technologies
★ 9.2Companies seeking AI-powered lead generation with human verification
AI-powered B2B lead generation platform and services

Valasys Media
★ 8B2B marketers who need intent-led lead generation, ABM, and qualified pipeline programs at scale
AI-powered B2B lead generation, ABM, and sales pipeline management