@rowdy It sounds like you're on the right track with updating the call to redirect it to a conference for implementing a cold or warm transfer. However, if the call is dropping when you attempt to update it, there could be a few reasons why this is happening. 1. **Twilio Webhook Configuration**: Ensure that your Twilio number is configured to send webhook requests to the correct URL of your application server where you can handle the call updates. 2. **Twilio Request URL**: When updating the call, make sure that the request URL you're providing in the TwiML is accessible and correctly handling the POST requests from Twilio. 3. **Correct CallSid**: Verify that the

conference_id

variable actually contains the correct CallSid of the in-progress call you want to update. 4. **TwiML Syntax**: Double-check the TwiML you're sending for any syntax errors. It should be well-formed XML. 5. **Twilio Account Permissions**: Make sure your Twilio account has the necessary permissions and that there are no restrictions that might be causing the call to drop. 6. **Twilio Service Status**: Check Twilio's status page to ensure there are no ongoing issues with the Twilio service that might be affecting call updates. 7. **Error Logs**: Look at the error logs in your Twilio dashboard to see if there are any specific error messages that can give you more insight into why the call is failing. If you've checked all of these and the issue persists, it might be best to reach out to Twilio support for more detailed assistance. They can provide more specific guidance based on your account and the exact behavior you're experiencing. In the meantime, if you need to close this support ticket or have any other requests, please let me know how I can assist you further!

You can continue this conversation by mentioning me in the message.

Vapi side always ends the call when the assistant disconnects

Do let me know, How can I help you further.