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@rowdy To transfer a call using TwiML only when the person picks up, and to keep the VAPI assistant on the line until the new user picks up, you would typically use the

<Dial>

verb with an action URL that can handle the call status callbacks. The

<Client>

noun is used to specify the identity of the client you're calling within Twilio's infrastructure. Here's an example of TwiML that could achieve this:

xml
<Response>
  <Dial action="yourActionURL" timeout="30">
    <Client>ajsdifoas</Client>
  </Dial>
</Response>

In this TwiML: - The

<Dial>

verb attempts to call the specified client. - The

action

attribute is a URL where Twilio will send asynchronous webhook requests to notify your application about the outcome of the

<Dial>

. This is where you can check if the person has picked up the call. - The

timeout

attribute specifies how many seconds Twilio should wait for the called party to answer before giving up. You would need to implement server-side logic at

yourActionURL

to handle the call status callbacks and determine if the call was answered before transferring the call. If the call is answered, you can then proceed with your desired call flow, possibly using additional TwiML to keep the VAPI assistant on the line or to perform other actions. Please note that the actual implementation details may vary based on your specific requirements and the capabilities of the VAPI you are using. If you need to integrate this with VAPI's phoneCallProviderBypassEnabled and phoneCallProviderDetails settings, please provide more details or ask support for more info on this.