Case study · Redialer.io
Callbacks your voice agent can actually keep.
Redialer is automated voice callbacks and SMS follow-ups for Retell agents, built and operated by TONNIC. When your agent promises to follow up, Redialer captures the request and places the outbound call or text at the right time — so the promise isn’t left to a human to remember.
Designed, engineered, and operated end-to-end by TONNIC AI Agency, with a secure per-agent integration into Retell. Live and continuously released.
Anatomy of a callback
Five steps between the promise and the callback.
- 01
Your agent promises a follow-up
During a Retell voice or SMS conversation, the caller asks to be called or texted back.
- 02
Redialer captures the request
The request and the exact time/timezone are captured via a signed per-agent webhook.
- 03
Scheduled for the right moment
Redialer schedules the callback timezone-aware, inside business hours, respecting quiet hours.
- 04
The outbound callback fires
At the requested time, Redialer places the outbound voice call or sends the SMS automatically.
- 05
Context preserved, logged
The original conversation context carries over, and every scheduled callback is tracked in the team dashboard.
Built for Retell
Plugs straight into your Retell agents.
- Retell voice + SMS agent integration.
- Read-only Retell agent API access.
- Per-agent webhook URLs with signature verification.
- Pass-through forwarding into existing systems.
- Vapi and Bland support on the roadmap.
Scheduling that respects reality
Callbacks land at the right moment, not just eventually.
- Timezone-aware callback times.
- Configurable business hours.
- Quiet-hours enforcement.
- Per-agent scheduling rules.
Built by TONNIC
The engineering work.
- Outbound voice + SMS scheduling engine.
- Signed per-agent webhook intake.
- Timezone / business-hours / quiet-hours logic.
- Conversation-context preservation across the callback gap.
- Read-only agent API integration.
- Team dashboard for scheduled callbacks.
- Continuous releases.
How this maps to TONNIC services
What we built for ourselves, we build for clients.
Every technical pattern in Redialer is something TONNIC ships for client projects, too.
AI Voice Agents
Real-time Retell voice and SMS agents that promise a follow-up and actually keep it, with outbound callbacks placed automatically. Same patterns as Redialer, scoped to your business.
Read the service →Automation & Integrations
Signed per-agent webhooks, read-only agent APIs, pass-through forwarding, and timezone- and business-hours-aware scheduled jobs. The plumbing that gets a callback to fire at exactly the right moment.
Read the service →Web & App Development
A team dashboard that tracks every scheduled callback, per-agent configuration surfaces, and the operator tooling around them. Real product surface, not a brochure site.
Read the service →
Want one of these for your business?
We build software end-to-end with the same engineers who ship and operate Redialer. Tell us what you have in mind.