conscious-sapphire
conscious-sapphire•4h ago

Call Transfer Not Working

Hi Guys, I'm trying to set up a call-transfer tool for my assistant. I have tried several things following other posts and answers but haven't had any luck. Details below. Experience: - I call the assistant through mobile / web interface - Guide conversation to initialise a call transfer - Tool call happens (can see in the logs / transcript) - Call hangs up (both on mobile / and web). this is what it looks like when I call via mobile (see attachment 1) vs via web (see attachment 2). My set up: I have a call transfer tool configured, and the assistant is given access to this tool. Configuration 1. - assistant bound to twilio imported number - forward to VAPI issued number (bound to a separate assistant) ❌ - forward to Australian Mobile Number (human) ❌ Configuration 2. - Assistant bound to VAPI issued number - Forward to Twilio Number ❌ - Forward to Aus Mobile ❌ The above have been tested with : - EC16 numbers vs sip transfers - Blind vs Warm transfers The experience is still the same. No forwarding. Appreciate your assistance here.
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1 Reply
Vapi
Vapi•4h ago
Suggestion:
Double-check that your TransferCall tool includes the required destination property in its parameters. Here’s the correct JSON configuration to add under your tool’s parameters: 
"parameters": {
  "type": "object",
  "properties": {
    "destination": {
      "type": "string",
      "enum": ["+1234567890"], // Replace with your external number in E.164 format
      "description": "The destination to transfer the call to."
    }
  },
  "required": ["destination"]
}
"parameters": {
  "type": "object",
  "properties": {
    "destination": {
      "type": "string",
      "enum": ["+1234567890"], // Replace with your external number in E.164 format
      "description": "The destination to transfer the call to."
    }
  },
  "required": ["destination"]
}
Update your tool with this, then retest the transfer.
For more details, see the Vapi call forwarding documentation. Sources: - Vapi documentation: call forwarding - Vapi SIP Trunking Telnyx external number call forwarding troubleshooting
⤵️ Mention @Vapi Support Bot for follow-ups 🐥

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