VAPI•3mo ago

Not able to transfer the calls.

its say transfer call failed

Vapi Support BotAPP•10/16/25, 10:01 AM

Try updating your TransferCall tool's parameters to include the required "destination" property in E.164 format.
Use the following JSON snippet in your tool configuration:

"parameters": {
  "type": "object",
  "properties": {
    "destination": {
      "type": "string",
      "enum": ["+1234567890"], // Replace with your external number
      "description": "The destination to transfer the call to."
    }
  },
  "required": ["destination"]
}

"parameters": {
  "type": "object",
  "properties": {
    "destination": {
      "type": "string",
      "enum": ["+1234567890"], // Replace with your external number
      "description": "The destination to transfer the call to."
    }
  },
  "required": ["destination"]
}

Update this in your function's parameters section and test the transfer again.
Reference: Vapi documentation: call forwarding

Source:

Vapi documentation: call forwarding

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

VVapi Support Bot **Try updating your TransferCall tool's parameters to include the required "dest...

DuckieAPP•10/16/25, 4:28 PM

Message marked as helpful by @GIDEON!

aware-amethyst•10/16/25, 7:08 PM

Hi, could you please provide a call id? We would like to review the logs

scattered-tealOP•10/17/25, 10:04 AM

hi @kyle
call id is
0199ee53-6ba0-7dd8-836a-a12b49134be8

scattered-tealOP•10/22/25, 7:18 PM

@kyle

KyleAPP•11/18/25, 4:31 AM

I sincerely apologize for the delayed response to your support request.
We implemented better tracking for support tickets to ensure timely responses going forward, but due to a technical limitation, this only applies to tickets created after this past week.
I'm closing this older ticket, but if your issue still needs attention, please:
Reply with 'REOPEN' or
Email support@vapi.ai with any updates
I'll personally ensure your new request gets prompt attention.
Thank you for your patience.
Best regards,
Vapi Support Team

"parameters": { "type": "object", "properties": { "destination": { "type": "string", "enum": ["+1234567890"], // Replace with your external number "description": "The destination to transfer the call to." } }, "required": ["destination"] }

Not able to transfer the calls.

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