Get a production-ready AI voice agent that qualifies leads, books appointments, and updates your CRM automatically — built with Retell AI or VAPI and tailored to your exact business workflow.
I Will Build a Custom AI Voice Calling Agent with Retell AI or VAPI
A professionally written AI voice agent prompt with call flow and personality design — the strategic foundation for your agent.
- Custom-written voice agent prompt
- Clear call flow architecture
- Personality and tone design
- AI LLM model integration
- Delivered as a ready-to-use prompt document
- Suitable for VAPI or Retell AI
Full AI voice agent deployment with live telephony setup, workflow logic, and 3 revisions — ready to take and make real calls.
- Everything in Starter Prompt
- VAPI or Retell AI agent setup and configuration
- Inbound and/or outbound call logic
- Webhooks, triggers, and escalation flows
- Natural, human-like voice conversation design
- Lead qualification or appointment-booking workflow
Complete end-to-end AI calling system with CRM integration, multi-language support, automation workflows, and 4 revisions.
- Everything in Agent Build
- CRM or database integration (HubSpot, GoHighLevel, Airtable, Sheets, etc.)
- Multi-language support
- SMS and/or email follow-up automation
- n8n, Zapier, or Make.com workflow connecting call to CRM
- End-to-end lead → call → CRM → follow-up pipeline
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Key details about this service to help you decide. Generated by Zinn Hub, not the seller.
Value Position
Platforms Supported
Automation Stack
CRM Integration
Best For
What You'll Receive
Full Description
Imagine your business handling inbound enquiries, qualifying leads, and booking appointments around the clock — without a single human on the phone. That is exactly what a well-built AI voice agent delivers, and that is precisely what this service provides.
Zinn Digital builds real, production-ready AI voice systems using Retell AI and VAPI, combined with automation platforms such as n8n, Zapier, and Make.com. Every agent is crafted to sound natural, follow intelligent call flows, and slot cleanly into your existing business tools.
**What Is Included**
At the foundation, every order includes a professionally written voice agent prompt — the backbone of how your AI speaks, thinks, and responds. This covers personality design, call flow architecture, and LLM model integration, ensuring the agent behaves consistently and on-brand from the very first call.
As you move up the tiers, the service expands to include full voice agent deployment (VAPI or Retell AI setup, live telephony configuration, inbound and outbound call logic, webhooks, and escalation flows) through to complete business system builds with CRM integration, multi-language support, SMS and email follow-ups, and end-to-end lead-to-CRM automation.
**How It Works**
1. You share your use case, preferred platform (VAPI or Retell AI), and any tools or CRMs you already use.
2. Zinn Digital designs and builds the agent to your specification.
3. You receive a test call or demo to validate voice quality, responses, and workflow before final handover.
4. Revisions are applied as needed, and the finished system is delivered ready to go live.
**Who This Is For**
This service suits business owners, operations managers, sales teams, and agencies who want to automate repetitive phone-based tasks — lead qualification, appointment booking, outbound follow-up, or customer triage — without building the technology themselves.
**Why Zinn Digital**
Zinn Digital works exclusively with proven platforms (Retell AI, VAPI, n8n, Zapier, Make.com) and has hands-on experience connecting voice agents to real CRM stacks including HubSpot, GoHighLevel, Airtable, Notion, and Google Sheets. The approach is practical and outcome-focused: no bloated setups, no unnecessary complexity — just systems that work reliably in live business environments.
If you want an AI that speaks, listens, thinks, and acts on behalf of your business, this is the right place to start.
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Compare Packages
| Feature | Starter Prompt | Agent Build | Full System |
|---|---|---|---|
| Delivery Time | 1 days | 4 days | 6 days |
| Revisions | 0 | 3 | 4 |
| Custom-written voice agent prompt | ✓ | ✕ | ✕ |
| Clear call flow architecture | ✓ | ✕ | ✕ |
| Personality and tone design | ✓ | ✕ | ✕ |
| AI LLM model integration | ✓ | ✕ | ✕ |
| Delivered as a ready-to-use prompt document | ✓ | ✕ | ✕ |
| Suitable for VAPI or Retell AI | ✓ | ✕ | ✕ |
| Everything in Starter Prompt | ✕ | ✓ | ✕ |
| VAPI or Retell AI agent setup and configuration | ✕ | ✓ | ✕ |
| Inbound and/or outbound call logic | ✕ | ✓ | ✕ |
| Webhooks, triggers, and escalation flows | ✕ | ✓ | ✕ |
| Natural, human-like voice conversation design | ✕ | ✓ | ✕ |
| Lead qualification or appointment-booking workflow | ✕ | ✓ | ✕ |
| Everything in Agent Build | ✕ | ✕ | ✓ |
| CRM or database integration (HubSpot, GoHighLevel, Airtable, Sheets, etc.) | ✕ | ✕ | ✓ |
| Multi-language support | ✕ | ✕ | ✓ |
| SMS and/or email follow-up automation | ✕ | ✕ | ✓ |
| n8n, Zapier, or Make.com workflow connecting call to CRM | ✕ | ✕ | ✓ |
| End-to-end lead → call → CRM → follow-up pipeline | ✕ | ✕ | ✓ |
Portfolio
Examples of the seller's work related to this Zinn.
Build a Custom AI Voice Calling Agent with Retell AI or VAPI
Build a Custom AI Voice Calling Agent with Retell AI or VAPI
Extra Information
Why Choose Me
Tools I Use
Perfect For
Frequently Asked Questions
Yes. Every agent prompt is written from scratch to match your brand voice, call objectives, and specific questions. The agent responds intelligently based on the conversation rather than simply reading a static script.
Both. You can choose whichever platform you prefer or already have an account with. If you are unsure which is the better fit for your use case, share your requirements and guidance will be provided.
Yes. On the Agent Build and Full System tiers, you will receive a test call or demo so you can validate voice quality, responses, workflow logic, and any integrations before final handover.
A brief description of your use case is enough to begin. If you already have a VAPI or Retell AI account, sharing your API key speeds things up. If not, setup guidance is included. For CRM integration, access credentials or API keys for your CRM will be needed.
CRM and database integration is included in the Full System tier and supports HubSpot, GoHighLevel, Airtable, Notion, Google Sheets, and similar platforms. The agent data flows through n8n, Zapier, or Make.com automation workflows.
Send a message before ordering with the details of your use case. Multi-step AI sequences, error handling, dashboard setup, or other advanced requirements can be scoped and quoted accordingly.
No — the Starter Prompt delivers the written prompt document, call flow design, and LLM integration guidance. It is the strategic foundation. For a fully configured, live agent, the Agent Build or Full System tier is the right choice.
Customer Reviews
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He went above and beyond, it was nice working with him. I will continue to work with him.
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