Hey Vapi team, I'm integrating Vapi into my virtual receptionist app. I need to preprocess incoming calls before forwarding them to Vapi, so if the user answers, they get connected directly - otherwise, the call is forwarded to a Vapi assistant. Currently, when I assign a Twilio number to Vapi, it automatically registers its webhook (https://api.vapi.ai/twilio/inbound_call). However, I need to intercept the call first, decide whether the user picks up, and only then forward it to Vapi if necessary. 1. How can I intercept and forward the call dynamically before it reaches Vapi? 2. Is there a way to manually forward calls to Vapi without assigning my Twilio number directly to Vapi? 3. Can I send calls to a Vapi SIP address dynamically instead of relying on Twilio auto-forwarding?

Instead of auto-registering your Twilio number with Vapi, you can: \- Set up your own webhook endpoint first \- Process the call as needed \- Forward to Vapi using TwiML when required Here's an example implementation:

// Your webhook endpoint
@app.post("/twilio/inbound_call", response_class=PlainTextResponse)
async def receive_call_data(
        AccountSid: str = Form(...),
...,
        ToZip: Optional[str] = Form(None)
):

    call_data = CallData(
        AccountSid=AccountSid,
....,
        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"]

\[source\] Key points: \- You don't need to register your Twilio number directly with Vapi \- You can dynamically decide when to forward to Vapi \- The call can be forwarded using either SIP or TwiML Stream \- Make sure to generate and track your own call IDs

Hey Shubham, this was super helpful - thanks!

Marking this ticket as solved.