Call Sandwich is a certified Elite-tier Retell AI partner — the highest level in Retell's partner program. We integrate Retell's voice AI agents into enterprise telephony systems that standard agencies won't touch.
What We Build
From outbound AI sales agents to enterprise inbound routing — we've built it on Retell.
Deploy Retell AI agents that call thousands of leads simultaneously, qualify prospects, and transfer hot leads live to your sales team. Integrated directly with ViciDial or any predictive dialer.
Replace your IVR with a conversational Retell AI agent. Integrate with NICE, Avaya, or Genesys to route calls intelligently, handle overflow, and provide 24/7 first-contact resolution.
Build seamless warm transfer flows where Retell AI agents collect context and hand off to live agents with full transcript and CRM data pre-populated. Zero friction, zero dead air.
AI agents that call leads, qualify them, and book appointments directly into your calendar (Calendly, GHL, custom). Integrate with your CRM for real-time disposition updates.
PCI-compliant Retell AI agents for outbound debt collection. Negotiate payment plans, take payments via DTMF, and update your debt management software in real time.
Need to resell voice AI under your brand? We build fully white-labeled Retell-powered platforms with multi-tenant agent management, billing integration, and client dashboards.
The Process
A repeatable, low-risk process refined across dozens of enterprise Retell deployments.
We map your existing telephony infrastructure — SIP trunks, PBX, CCaaS platform, dialers, carriers. We identify the optimal integration point for Retell AI and define the architecture.
We design the conversation flows, define agent personas, engineer prompts for your specific use case, and plan the integration layer between Retell and your telephony system.
Our engineers configure the SIP trunk connections, build the call routing logic, implement CRM webhooks, and deploy the Retell agents to your production environment with staging validation.
We run comprehensive QA — from conversation flow testing to 100+ concurrent call load tests. We optimize latency, fine-tune the AI behavior, and ensure enterprise-grade reliability.
Controlled rollout with real-time monitoring. Post-launch, we analyze call recordings, iterate on prompts, and continuously improve performance as your AI agent scales.
Retell + Your Stack
If it has a SIP trunk, webhook, or API — we can connect it to Retell.
Ready to get a proposal? Fill out our scoping form and we'll design your custom Retell integration.