Global leader in B2B lead generation honored for its complete-team approach and proven results with enterprise clients.
Callbox has been named one of the top SDR outsourcing companies in 2025, earning recognition across respected industry lists including Revnew, Pearl Talent, The Manifest, and Join Genius.
The recognition underscores Callbox’s role as a trusted partner for enterprises worldwide, delivering SDR-led outreach backed by data, AI, and a complete outsourced sales team that ensures consistent, qualified meetings and sustained pipeline growth.
Recognition by Revnew: Global SDR Outsourcing Expertise
In its Top SDR Outsourcing Companies 2025 list, Revnew highlighted Callbox’s success serving global enterprises across multiple sectors.
Key strengths included:
- Scalable SDR-led telemarketing solutions, handling high call volumes with efficiency.
- Multi-channel lead generation, powered by SDR-driven outreach via email, calls, and social media.
- Proven SDR nurturing strategies that convert leads into long-term clients.
Revnew concluded that Callbox’s ability to scale and nurture leads globally makes it one of the most reliable SDR outsourcing companies for enterprise outreach.
Tired of chasing low-quality leads? Get better leads and faster with Callbox SDRs.
Featured by Pearl Talent: Outsourced SDR Services with Dedicated Teams
According to Pearl Talent, companies looking for outsourced SDR services often turn to Callbox.
Pearl Talent emphasized Callbox’s complete-team model, where SDRs collaborate with Client Success Managers, Data Analysts, and Digital Marketers. This structure ensures that outsourced sales reps work as part of a strategic sales outsourcing company that delivers sustainable pipeline growth, not just one-off appointments.
Listed on The Manifest: Global Outsourced Sales Team Capabilities
The Manifest’s list of top sales outsourcing companies included Callbox for its international presence and enterprise partnerships.
The Manifest highlighted Callbox’s strength in global market penetration and localized execution across North America, APAC, EMEA, and LATAM. It also praised Callbox’s strict adherence to compliance, a vital factor in evaluating outsourced SDR services.
Recognized by Join Genius: Proven Outsourcing Sales Results
In its B2B Sales Outsourcing Companies list, Join Genius spotlighted Callbox’s two decades of growth. From its founding in 2004 to becoming one of the largest providers of outsourced sales teams, Callbox has scaled globally with more than 800 employees.
Highlights include:
- Over 1.3 million qualified leads delivered.
- More than 20,000 lead-generation programs executed.
- Serving clients in 60+ countries using human and AI-powered strategies.
This recognition reinforces Callbox’s reputation as a top-performing SDR outsourcing company with a proven record of results.
Beyond SDR Outsourcing: A Complete Sales Development Partner
Unlike other SDR outsourcing companies that provide reps in isolation, Callbox delivers dedicated SDRs within a complete outsourced sales team. SDRs work with strategists, data experts, and marketers to manage the entire lead generation process.
This model ensures consistent meeting generation and a sustainable sales pipeline for long-term client success.
Why Callbox Stands Out Among SDR Outsourcing Companies
Callbox’s ranking across multiple outlets reflects its ability to:
- Deliver 20+ years of outsourced sales expertise across industries.
- Execute AI + human SDR outreach, balancing automation with personal engagement.
- Run global campaigns with local expertise, adapting strategies by region.
- Earn enterprise trust, working with Salesforce, AWS, and Google.
- Operate as a compliance-first partner, meeting GDPR, CAN-SPAM, and CCPA standards.
Best Practices When Working with SDR Outsourcing Companies
Callbox advises businesses to follow these best practices when engaging outsourced SDR services:
- Set clear goals with defined lead qualification criteria.
- Integrate CRMs for seamless data sharing.
- Collaborate on messaging to align SDR outreach with brand voice.
- Track KPIs like meetings booked, lead-to-opportunity conversion, and deal progression.
- Ensure compliance with data privacy and telemarketing regulations.
Executive Quote
“Our recognition across multiple industry rankings confirms what our clients already know: outsourcing SDRs is most effective when reps are backed by data, technology, and a complete team structure,” said Rom Agustin, CEO of Callbox. “We’re proud to be celebrated not only for the pipeline results we deliver, but also for the trust we’ve built with enterprises worldwide.”
Looking Ahead: The Future of SDR Outsourcing
The future of outsourcing sales development is moving away from standalone SDRs. Enterprises now demand complete outsourced sales teams that combine strategy, AI-driven data, and human expertise.
Callbox continues to lead this transformation in 2025, setting the standard for outsourced SDR services that scale globally, deliver measurable results, and drive sustained business growth.
