unwilling-turquoise•6mo ago

call_id

Is there a way in which we can also sent the call_id of the call during the tool call, while the call is ongoing??

11 Replies

Yes, the call_id is included in the tool call payload sent to your server during an ongoing call.
You can access it like this in your handler:

const callId = req.body.message.call.id;

const callId = req.body.message.call.id;

Just extract it from the "call" object in the incoming request and use it as needed in your tool logic. Source: - Custom Tools Documentation

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

unwilling-turquoiseOP•6mo ago

This is how the tool call is made but i dont see the call_id??

unwilling-turquoiseOP•6mo ago

@Vapi Team ???

ambitious-aqua•6mo ago

Yes, Vapi includes the call_id in live tool calls via the controlUrl and webhooks, so you can use it during an ongoing call without needing to send it manually..

ambitious-aqua•6mo ago

https://docs.vapi.ai/calls/call-features

Live Call Control | Vapi

unwilling-turquoiseOP•6mo ago

But How do i do it in the prompt ?? ??

ambitious-aqua•6mo ago

You can reference {{call.id}} directly in your prompt, and Vapi will automatically inject the live call ID during the call, making it available for tools like transferCall without needing to pass it manually..

unwilling-turquoiseOP•6mo ago

@Kings_big💫 I tried that still doesnt work

Create_user{
  firstName: firstname,
  lastName: lastname,
  dob: dob,
  pob: pob,
  gender: User's Gender(m/f)
  id: "{{call.id}}",
  caller_id: "15e0a521",
  endpoint: "create_client"
}

Create_user{
  firstName: firstname,
  lastName: lastname,
  dob: dob,
  pob: pob,
  gender: User's Gender(m/f)
  id: "{{call.id}}",
  caller_id: "15e0a521",
  endpoint: "create_client"
}

{
  "role": "tool_calls",
  "time": 1749645663784,
  "message": "",
  "toolCalls": [
    {
      "id": "call_QsjcE3dOl7wLhH5KYVYfxQH0",
      "type": "function",
      "function": {
        "name": "Create_user",
        "arguments": "{\n  \"firstName\": \"John\",\n  \"lastName\": \"Test\",\n  \"dob\": \"1989-01-01\",\n  \"pob\": \"L6H6M4\",\n  \"gender\": \"m\",\n  \"id\": \"\",\n  \"caller_id\": \"15e0a521\",\n  \"endpoint\": \"create_client\"\n}"
      }
    }
  ],
  "secondsFromStart": 113.478
}

{
  "role": "tool_calls",
  "time": 1749645663784,
  "message": "",
  "toolCalls": [
    {
      "id": "call_QsjcE3dOl7wLhH5KYVYfxQH0",
      "type": "function",
      "function": {
        "name": "Create_user",
        "arguments": "{\n  \"firstName\": \"John\",\n  \"lastName\": \"Test\",\n  \"dob\": \"1989-01-01\",\n  \"pob\": \"L6H6M4\",\n  \"gender\": \"m\",\n  \"id\": \"\",\n  \"caller_id\": \"15e0a521\",\n  \"endpoint\": \"create_client\"\n}"
      }
    }
  ],
  "secondsFromStart": 113.478
}

id remained null @Vapi @Duckie ??

ambitious-aqua•6mo ago

{{call.id}} only works inside assistant prompts during live calls, it won’t auto-fill in tool calls, so you need to either reference it in the prompt or pass it manually from a webhook..

unwilling-turquoiseOP•6mo ago

@Kings_big💫 @Shubham Bajaj how do i reference it in the vapi prompt in vapi dashboard??

Kyle•6mo ago

Just use the dynamic variable {{call.id}} inside the assistant prompt.

call_id

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