Vapi is the Voice AI platform for developers.

Vapi AI

My assistant should call my customer and with that phone number, search in the database and extract a json file. Ive been fighting with this problem for hours. Everything works fine but the assistant isn’t extracting the correct phone number.
https://cdn.discordapp.com/attachments/1382571111212126229/1382571111966838854/IMG_5459.jpg?ex=684ba330&is=684a51b0&hm=8ec640221f0aaaec2e6221bcb0e2ce10cb41f5ff589e65cc6bf46ba4e8466f3f&

**To ensure the assistant extracts the correct phone number, make sure your outbound call payload includes the `customer` object with the `number` field, and reference it as `{{customer.number}}` in your function or prompt.**

Example payload:
```json
{
  "assistantId": "your-assistant-id",
  "phoneNumberId": "your-phone-id",
  "customer": {
    "number": "+11231231234"
  },
  "assistantOverrides": {
    "variableValues": {
      // other variables if needed
    }
  }
}
```
In your API request, use `"phone_input": "{{customer.number}}"`.  
*Double-check that the variable is spelled exactly as shown and that the customer number is present in the payload.*  
[See official docs for details.](https://docs.vapi.ai/assistants/dynamic-variables)

Sources:
- [Vapi Docs: Dynamic Variables](https://docs.vapi.ai/assistants/dynamic-variables)
- [Vapi Docs: Outbound Calling](https://docs.vapi.ai/calls/outbound-calling)

Message marked as helpful by <@1343631097862553654>! 🎉

Hey! To help track down this issue, could you share:

- The call ID
- When exactly this happened (the timestamp)
- What response you expected to get
- What response you actually got instead  
  This would really help us figure out what went wrong!