Outsourcing your SDR function can transform pipeline—if you pick the right partner. The best outsourced SDR agency blends scale (data, automation, dialing) with persuasion (voice, objection handling, relevant messaging). The wrong choice burns domains, books unqualified meetings, and wastes AE time. This guide gives you a clear selection framework, common pitfalls to avoid, and a balanced comparison of the top agencies—then explains where Outbound Sales Pro fits.
How to Choose an Outsourced SDR Agency (Fast Framework)
- Stage & fit: Startups need flexible contracts and fast ramp; enterprises need global coverage, security, and compliance.
- Approach: Ask how they balance automation (data enrichment, sequencing) with human persuasion (calls, voice coaching, LinkedIn).
- Throughput vs. quality: Inspect connect rate, meeting acceptance rate, and show rate—not just dials or booked meetings.
- Email deliverability: Look for SPF/DKIM/DMARC, throttling, domain pools, and reply handling—not just copywriting.
- Transparency: Request reporting access, sample call recordings, sequence previews, and weekly coaching cadences.
Common Pitfalls to Avoid
- Quantity over quality: 30 booked meetings/month is meaningless if they’re off-ICP. Track accepted and held meetings.
- Price-only selection: Ultra-low retainers often mean weak data, poor training, and domain burn.
- Set-and-forget: Great programs iterate weekly on lists, messaging, and talk tracks.
- Underpowered dialing: Without parallel dialing, reps spend more time ringing than talking.
The 10 Best Outsourced SDR Agencies in 2025
We reviewed publicly available service pages, pricing snapshots, and third-party review footprints. Below, each listing includes Best for, Core services, Pricing snapshot (if published), Review signals, and Watch-outs.
1) Outbound Sales Pro (Best for Efficiency & B2B, SaaS and Services Pipeline)
Why #1: OSP trains SDRs for persuasion (voice-inflection coaching, objection handling) while scaling throughput with parallel dialing and deliverability-first cold email via sister platform Parakeet. Programs emphasize accepted & held meetings, not vanity volume.
- Best for: SaaS & complex B2B where quality and speed both matter.
- Core services: Multi-channel outbound (calls/email/LinkedIn), parallel dialing, list research & enrichment, deliverability guardrails, inbox management, weekly coaching & call reviews.
- Pricing snapshot: Custom to ICP complexity, channel mix, and meeting acceptance targets.
- Review signals: See OSP’s references and call samples on request.
- Standout: Voice-inflection training + parallel dialing routinely drives 2–3× SDR efficiency over typical in-house teams.
2) Belkins
- Best for: Broad B2B coverage with strong appointment-setting focus.
- Core services: Appointment setting, cold email, LinkedIn lead gen, lead research; additional options include ABM and deliverability consulting. Belkins services.
- Pricing snapshot: Retainer tiers with custom packages; ranges discussed in Belkins’ pricing content. Pricing overview Pricing models explainer.
- Review signals: Active G2 presence and badges; check recent reviews for context. G2.
- Watch-outs: Standardized playbooks can bias toward volume over deep personalization in some markets.
3) CIENCE
- Best for: Data-heavy programs that prioritize scale and global coverage.
- Core services: Data + outsourced SDR, multi-channel sequences; increasing AI emphasis. Review buyer feedback on third-party sites for program fit. G2 reviews.
- Watch-outs: Automation-first motion can feel less personal for nuanced ICPs; vet talk tracks and call quality for brand fit.
4) SalesHive
- Best for: Teams that want clear, published packages and flexible terms.
- Core services: BDR/SDR programs across phone and email with an in-house platform. Site.
- Pricing snapshot: Public tiers; month-to-month contract option highlighted. Pricing page.
- Review signals: Trustpilot currently shows ~3.1/5 from a small sample; read comments for context. Trustpilot.
- Watch-outs: Confirm dialing approach and whether parallel/multi-line is available if throughput is a priority.
5) memoryBlue
- Best for: Enterprise tech and global expansion.
- Core services: SDR outsourcing and sales acceleration; expanded global reach after acquiring Operatix (UK/US/SG). Operatix news PR.
- Watch-outs: Larger programs can feel standardized—ask about pod composition and coaching cadence for your ICP.
6) Martal Group
- Best for: Enterprise tech (IT, SaaS, cybersecurity) with complex buying groups.
- Core services: SDRs plus senior sellers; emphasis on intent data and enterprise plays. Site.
- Review signals: Strong Clutch review footprint and awards; scan recent reviews for vertical fit. Clutch Awards.
- Watch-outs: Playbook-driven approach may be less ideal for brand-new markets that need heavy testing.
7) SalesRoads
- Best for: US-focused appointment setting with rigorous project management.
- Core services: Dedicated SDR pods, research + phone/email execution. Why Us.
- Review signals: Positive client sentiment on G2/Clutch regarding quality and PM discipline. G2 Clutch.
- Watch-outs: Pricing can be higher for startups; confirm volume expectations and vertical expertise.
8) LevelUp Leads
- Best for: SMBs/startups wanting flexible outsourced SDR with clear pricing starting points.
- Core services: Fractional/full-service SDR, multi-channel outreach, list research. Site Services.
- Pricing snapshot: Publicly notes packages start around $5,000+/mo depending on scope. Pricing.
- Review signals: Active Clutch/G2 profiles; check latest ratings/comments. G2 Clutch.
9) RevBoss
- Best for: Founder-led teams that want a lighter-weight, software-assisted outbound motion.
- Core services: Outbound programs supported by RevBoss platform; review current site focus and packages. Pricing G2.
- Pricing snapshot: Public page notes programs start around $1,500+/mo (confirm scope during sales process). Source.
- Watch-outs: Ensure services align with present-day focus (they’ve emphasized founder-led marketing content—confirm outbound SDR scope).
10) AltiSales
- Best for: Tech companies that want GTM consulting plus SDR execution.
- Core services: SDR outsourcing, GTM strategy, and an “SDR Assembly Line” model; long-running category specialist. Site SDR outsourcing.
- Watch-outs: Boutique capacity—align on timelines and pod availability for larger rollouts.
RFP Checklist: Questions to Ask Before You Sign
- What’s your dialing setup? Do you support parallel dialing? What’s your typical connect rate by segment?
- How do you protect email deliverability? (SPF/DKIM/DMARC, warmup, throttles, domain pools, reply handling)
- What are your targets for accepted and held meetings for ICP?
- Can we hear sample calls for similar titles/industries?
- How often do you iterate on lists, messaging, and talk tracks? Weekly coaching cadence?
- What reporting do we get (dashboards, recordings, sequence metrics)?
Why Many Teams Choose OSP First
Throughput + persuasion. We combine parallel dialing (5–10× more live conversations/hour) with state of the art SDR and voice-inflection coaching to turn connects into meetings—then protect your domain with deliverability-first email via Parakeet. If you need a predictable, quality pipeline—not just activity—let’s talk.
FAQ
How much do outsourced SDR agencies cost?
Public retainers typically start around $5k–$12k+/mo depending on channels, volume, and data scope; some vendors publish ranges or starter tiers. Always confirm what’s included (dialers, data, deliverability, coaching). Examples: SalesHive publishes tiers and month-to-month options; LevelUp notes packages starting around $5k+; RevBoss lists entry pricing on its site.
What review sites should I check?
Scan G2 and Clutch for client sentiment and recent comments; Trustpilot sometimes has smaller sample sizes. Use reviews as signals, not absolutes—listen to a few recorded calls and inspect reporting before you decide.
