confirmSound to provide audio instructions after a B-leg answers. You can configure confirmKey with the digit mentioned in those instructions.
Vobiz requests the confirmSound URL using the POST HTTP method for a valid Play, Speak, or a Wait XML element. To play a message asking the recipient to input a DTMF tone to connect the call, return the second XML example.
Example
Response
5 as the confirmation digit. It does not guarantee that Vobiz will withhold the connection when the recipient does not press it.
Return the following XML to play a message: