How to translate first and end call messages

broad-salmon · 2025-05-29T00:34:43.103Z

We have a client that wants a single assistant to be able to handle 5 different languages. The transcriber and tool messages have the options to be translated, but the first message and end of call message do not appear to have that option. Is there something we're missing in the API?

E

extreme-purple•5/29/25, 2:13 PM

The first and end-of-call messages don’t currently support dynamic translation, workarounds involve detecting the caller’s language and setting those messages programmatically before the call.

V

Vapi Support BotAPP•5/29/25, 2:15 PM

Vapi does not currently support dynamic translation of the first or end call messages at runtime.
To handle multiple languages, detect the caller's language before the call and set the

firstMessage

firstMessage

firstMessage

firstMessage and

endCallMessage

endCallMessage

endCallMessage

endCallMessage fields programmatically in your API request. For example:

{
  "assistantId": "your-assistant-id",
  "assistantOverrides": {
    "firstMessage": "Hallo, wie kann ich Ihnen helfen?"
  }
}

{
  "assistantId": "your-assistant-id",
  "assistantOverrides": {
    "firstMessage": "Hallo, wie kann ich Ihnen helfen?"
  }
}

{
  "assistantId": "your-assistant-id",
  "assistantOverrides": {
    "firstMessage": "Hallo, wie kann ich Ihnen helfen?"
  }
}

{
  "assistantId": "your-assistant-id",
  "assistantOverrides": {
    "firstMessage": "Hallo, wie kann ich Ihnen helfen?"
  }
}

You must manage language detection and message selection in your own application logic before starting the call.

Sources:

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

V

Vapi Support BotAPP•5/29/25, 2:15 PM

Vapi does not currently support dynamic translation of the first or end call messages at runtime.
To handle multiple languages, detect the caller's language before the call and set the

firstMessage

firstMessage

firstMessage

firstMessage and

endCallMessage

endCallMessage

endCallMessage

endCallMessage fields programmatically in your API request. For example:

{
  "assistantId": "your-assistant-id",
  "assistantOverrides": {
    "firstMessage": "Hallo, wie kann ich Ihnen helfen?"
  }
}

{
  "assistantId": "your-assistant-id",
  "assistantOverrides": {
    "firstMessage": "Hallo, wie kann ich Ihnen helfen?"
  }
}

{
  "assistantId": "your-assistant-id",
  "assistantOverrides": {
    "firstMessage": "Hallo, wie kann ich Ihnen helfen?"
  }
}

{
  "assistantId": "your-assistant-id",
  "assistantOverrides": {
    "firstMessage": "Hallo, wie kann ich Ihnen helfen?"
  }
}

You must manage language detection and message selection in your own application logic before starting the call.

Sources:

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

VVapi Support Bot **Vapi does not currently support dynamic translation of the first or end call m...

D

DuckieAPP•5/29/25, 4:02 PM

Message marked as helpful by @Devon Humes!

K

KyleAPP•5/29/25, 9:47 PM

Hey Devon, checking if this is resolved/solved for you?

B

broad-salmonOP•6/2/25, 7:11 PM

Yes, if we cannot translate those messages, then yes.

K

KyleAPP•6/3/25, 7:48 PM

Hey Devon, there is definitely a solution for your use case but wanted to clarify what your use case is? I want to understand how you plan to deliver this project or take input from your customers. This will help me suggest something that can assist you in creating multilingual options with reusability. I hope you understand why I'm asking these questions.

How to translate first and end call messages

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