I’m building a pilot proposal for a client and want to sanity-check if this... Retell AI #❓・ai-evy-support

I’m building a pilot proposal for a client and wan...

enes (ekkovoice)

01/30/2026, 10:21 AM

@AI Evy I’m building a pilot proposal for a client and want to sanity-check if this is 100% technically feasible with Retell before I commit. Use case: We want an AI outbound agent that: • Calls leads automatically within 2–5 minutes after form submission • Asks qualification questions (role, goals, availability, culture fit) • Detects voicemail and leaves a prerecorded message • If the lead calls back later → plays a greeting (via TeXML or similar) • Optionally routes callbacks into a live AI agent flow • Books Google Meet meetings automatically • Pushes structured data into a CRM via Make/Zapier • Supports Dutch language • Handles ~300 outbound calls/month initially • Supports future multi-language bots (SE/DE) Specific questions: 1. Does Retell support outbound calls + voicemail detection + message drop natively? 2. Can inbound callbacks trigger a custom greeting flow and optionally transition into an AI agent? 3. Can inbound and outbound numbers be shared so leads call the same number back? 4. Does Retell support Dutch STT/TTS well in production? 5. What’s the best way to push call data + fields into external CRMs (webhooks, Make, etc.)? 6. Any known limitations at ~300–800 calls/month? 7. Is multi-bot / multi-language setup supported under one account? Trying to avoid selling anything that’s hacky or unreliable — want production-grade.

AI Evy

01/30/2026, 10:21 AM

Thanks for tagging me @enes (ekkovoice). I'll look through relevant sources and get back to you shortly.

AI Evy

01/30/2026, 10:22 AM

### Answer Here's a breakdown based on the available documentation: ## 1. Outbound Calls + Voicemail Detection + Message Drop Yes, natively supported. Retell AI can detect voicemail responses and either hang up or leave a pre-recorded or dynamically generated message. [(1) ]() The agent configuration includes

enable_voicemail_detection

voicemail_message

voicemail_detection_timeout_ms

, and

voicemail_option

settings. [(2) ]() Example from the API response:

Copy code

json
"enable_voicemail_detection": true,
"voicemail_message": "Hi, please give us a callback.",
"voicemail_detection_timeout_ms": 30000,
"voicemail_option": {
  "action": {
    "type": "static_text",
    "text": "Please give us a callback tomorrow at 10am."
  }
}

AI Evy

01/30/2026, 10:22 AM

Note: Ensure you publish your agent version after configuring voicemail settings—unpublished changes won't take effect. [(3) ]() ## 2. Inbound Callbacks with Custom Greeting + AI Agent Transition Yes. You can configure different agents for inbound vs outbound on the same phone number. The phone number configuration supports both

inbound_agent_id

and

outbound_agent_id

. [(4) ]() You can design conversation flows with custom greetings and transitions using Retell's conversation flow builder. [(5) ]() ## 3. Shared Inbound/Outbound Numbers Yes. A single phone number can have both an

inbound_agent_id

and

outbound_agent_id

configured, so leads call back the same number. [(4) ]() ## 4. Dutch Language Support The agent configuration includes a

language

field. [(2) ]() However, I don't have explicit documentation confirming Dutch (

nl-NL

) STT/TTS quality in production. You'd want to test this directly or contact Retell support at compliance@retellai.com for confirmation on Dutch language performance. ## 5. Pushing Data to CRMs Multiple options supported: - Webhooks: Retell supports webhooks that receive real-time data updates for call events. [(5) ]() - Make integration: Retell has native integration with Make. [(1) ]() - Post-call analysis: You can configure

post_call_analysis_data

to extract structured fields (string, boolean, number, selector types) from calls. [(2) ]()

AI Evy

01/30/2026, 10:22 AM

Copy code

json
"post_call_analysis_data": [
  {
    "type": "string",
    "name": "customer_name",
    "description": "The name of the customer.",
    "examples": ["John Doe", "Jane Smith"]
  }
]

## 6. Volume Limitations at 300–800 Calls/Month No documented limitations at this volume. Retell supports concurrent calling and batch calling for large-scale outreach. [(1) ]() Pay-as-you-go users have a quota of 20 concurrent calls, which can be upgraded. For batch calling, there was a temporary outage recently but it should be resolved—check [status.retellai.com]() for current status. [(6) ]() ## 7. Multi-Bot / Multi-Language Under One Account Yes. You can create multiple agents with different language configurations under one account. The

language

field is configurable per agent. [(2) ]() For client isolation, you can also set up separate workspaces. [(6) ]() --- What I couldn't confirm from documentation: - Google Meet booking specifically (Cal.com integration is documented [(1) ]() , but Google Meet native integration would need verification) - Dutch language production quality specifically Check out these potentially useful sources for additional details: - [Handle Voicemail]() - [Concurrency]() - [Batch Call Feature]() Would you like a general answer on the Google Meet booking question based on common integration patterns?

AI Evy

01/30/2026, 10:22 AM

To learn more, see the sources I considered: [[1] AI Voice Agent Platform for Phone Call Automation - Retell AI](https://www.retellai.com) [[2] Get Voice Agent](https://docs.retellai.com/api-references/get-agent) [[3] Voicemail detection issues](https://discord.com/channels/1186424376300679209/1457814467508306121) [[4] 404 Error on Create a Phone Call](https://retell.discourse.group/t/404-error-on-create-a-phone-call/22) [[5] AI Voice Agents in 2025: Everything Businesses Need to Know | Retell AI](https://www.retellai.com/blog/ai-voice-agents-in-2025) [[6] Discord message from @silvioo_q on 2026-01-29](https://discord.com/channels/1186424376300679209/1186462578310910112/1466328084901925020)

AI Evy

01/30/2026, 10:22 AM

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

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