precall webook for data
# supportg
Gregb
04/11/2025, 3:05 PMHow can I send dynamic pre-call data to Vapi’s assistant, like customer details, using an API or webhook, similar to Bland AI’s pre-call webhook setup?
v
Vapi Support Bot
04/11/2025, 3:07 PMHi there! 👋
While I don't have complete details about Bland AI's specific pre-call webhook setup, I can definitely help you with how to send dynamic pre-call data to Vapi's assistant using APIs and webhooks!
Here are several approaches you can use to send dynamic data to Vapi before a call:
## 1. Set Up Your Own Webhook Endpoint
You can create your own webhook endpoint to intercept calls before they reach Vapi:
Copy code
javascript
// Your webhook endpoint
@app.post("/twilio/inbound_call", response_class=PlainTextResponse)
async def receive_call_data(
AccountSid: str = Form(...),
// other parameters
ToZip: Optional[str] = Form(None)
):
call_data = CallData(
AccountSid=AccountSid,
// other data
ToZip=ToZip
)
r = requests.post("https://api.vapi.ai/call", json={
"phoneNumberId": "your-phone-number-id",
"phoneCallProviderBypassEnabled": True,
"customer": {
"number": call_data.Caller
},
"assistantId": "your-assistant-id"
}, headers={
"Content-Type": "application/json",
"Accept": "application/json",
"Authorization": f"Bearer {api_key}"
})
result = r.json()
return result["phoneCallProviderDetails"]["twiml"]assistantOverridesvariableValuesassistantOverridesvariableValues Copy code
json
{
"variableValues": {
"name": "CustomerName",
"accountId": "12345",
"otherData": "value"
}
}Vapi Support Bot
04/11/2025, 3:07 PMThis allows you to set variables dynamically for each call, [as mentioned in this Discord thread](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1335054553250533439).
## 3. Use Vapi's API Endpoints
Vapi provides API endpoints for creating and updating calls that can be used to send pre-call data:
Copy code
bash
curl -X POST 'https://api.vapi.ai/call' \
-H 'Authorization: Bearer YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{
"phoneNumberId": "your-phone-number-id",
"phoneCallProviderBypassEnabled": true,
"customer": {
"number": "customer-phone-number"
},
"assistantId": "your-assistant-id",
"assistantOverrides": {
"variableValues": {
"customerName": "John Doe",
"accountStatus": "Premium"
}
}
}' Copy code
javascript
const assistantOverrides = {
variableValues: {
name: "Alice",
accountType: "Premium",
lastPurchase: "2025-03-15"
},
};
vapi.start("your-assistant-id", assistantOverrides);g
Gregb
04/11/2025, 3:12 PM@Vapi so no direct way?
Gregb
04/11/2025, 3:13 PM/help no direct way?
p
Praveen
04/14/2025, 6:13 AMa gentle reminder to continue this thread.
u
utsav
04/14/2025, 12:58 PM@Shubham Bajaj how to enable an agent to send an assistant-request webhook? I don't see an option in the Messaging tab for an agent
https://cdn.discordapp.com/attachments/1360269517212749945/1361324751577944254/image.png?ex=67fe57f8&is=67fd0678&hm=7dfbd26d6c0d0bdf4da354566dd03aa9ca6b081be5ecf414da84a05f0e362546&
4 Views