White-Labeling Retell AI
with Fusion Calling
Retell AI is a powerful conversational voice engine. Fusion Calling is the white-label agency layer built to work with it — adding branding, client portals, multi-client management, and client billing so you can resell Retell under your own brand.
A Great Voice Engine, Now a Sellable Product
Retell AI has earned its reputation for a reason. Its conversational quality, low-latency responses, and flexible agent configuration make it one of the strongest voice engines available for building natural-sounding AI calls. If you are already building on Retell, you have made a smart technology choice.
What Retell gives you is the engine. What most agencies discover, though, is that an engine on its own is not yet a product you can sell to clients at scale. To turn Retell into a branded, billable offering, you need a layer on top: your own identity, dedicated client access, a way to manage multiple clients, and a clean way to charge for it.
That is the layer Fusion Calling is built to provide — alongside Retell, not against it.
What Fusion Calling Adds on Top of Retell
Think of Fusion Calling as the agency layer that wraps around Retell. You bring your Retell account; we provide everything your clients see and everything you need to run a multi-client business. This saves you from building the white-label layer yourself — most agencies launch in about 7 days instead of weeks or months of custom development.
Full Branding & Custom Domain
Apply your logo, colors, and a custom domain so every client touchpoint carries your agency's identity — never anyone else's.
White-Label Client Portals
Give each client their own branded login to review calls, agents, and activity without ever leaving your brand.
Sub-Account Management
Manage every client from a single dashboard, with per-client settings, usage, and permissions cleanly separated.
Client Rebilling
Set your own pricing per client and bill them directly through the platform — no spreadsheets, no manual invoicing.
Done-With-You Setup
You are not left to figure it out alone. Our team helps you connect your Retell account, apply your branding, and onboard your first clients — typically getting you to launch in around a week.
How Retell + Fusion Calling Work Together
The flow is intentionally simple. Fusion Calling sits in front of Retell, handling the client-facing experience and the business operations, while Retell keeps doing what it does best: the conversation itself.
Connect Retell
Link your existing Retell account with a single API key — no migration required.
Brand It
Apply your logo, colors, and custom domain across the entire client experience.
Manage Clients
Spin up sub-accounts and white-label portals for each client from one dashboard.
Bill Clients
Set your own prices and rebill clients directly — you keep 100% of what you charge.
Bring Your Retell Agents Along
If you have already invested time in Retell — configuring agents, writing prompts, tuning assistants — that work comes with you. Fusion Calling does not require you to rebuild your agents from scratch.
Because we connect to your Retell account directly, your existing agent configs and assistants carry over. You keep the conversational setup you already trust; you simply gain a branded, multi-client, billable product around it.
The Economics: Simple and Yours
Fusion Calling is a subscription, not a take of your revenue. You set the price you charge clients, and you keep 100% of that client revenue. The only cost is your Fusion Calling plan:
Starter
$99/mo
Up to 6 sub-accounts
Growth
$299/mo
Up to 20 sub-accounts
Scale
$499/mo
Unlimited sub-accounts
💡 You keep 100% of client revenue — Fusion Calling never takes a cut of what you charge.
Built With Retell — And Ready for More
Fusion Calling is built to work with Retell, and it also supports Vapi and ElevenLabs, so you can match the right provider to each client or use case without rebuilding your white-label setup. Need to tie calls into your clients' existing tools? Fusion Calling integrates with GoHighLevel via API and webhooks, and connects to more than 2,200 apps — so voice AI fits into the workflows your clients already run.
Turn Retell Into Your Branded Product
Retell AI gives you a best-in-class voice engine. Fusion Calling gives you the agency layer to sell it: your brand, your client portals, your sub-accounts, and your billing. Together, they let you launch a complete, white-label voice AI business in about 7 days.
Want to see it in action? There is a live demo on the homepage, or you can apply to start white-labeling Retell today.
Start White-Labeling Retell→About the Author
Fusion Calling Team
We're the team behind Fusion Calling's white-label AI voice platform. Having helped 50+ agencies launch profitable voice AI practices since 2025, we specialize in helping businesses scale their phone operations with cutting-edge automation technology.