It does work with VVB but there are things to be aware of regarding how it handles non-bridged transfers.   Implementing a SIP REFER to perform a non-bridged transfer will work in CVP VoiceXML standalone model for calls originating from either IOS de...

Your issue is that the VVB does a SIP REFER for VoiceXML non-bridged transfers.   This is executed entirely as fire and forget, which is why the Studio app shows the transfer as completed.   Unfortunately, the CVP SIP B2BUA which is the component in ...

Since this appears to be Agent Request API driven callback, despite the outgoing call being originated automatically at the agent device, you can in fact control when the callback to the customer is made by inserting a preview & accept stage.  There'...

Gerry,In the meantime why not use the REST client element with a POST and multipart body.   There's a body construct example here https://app.box.com/s/j4hhnozpa6vvl83ddvb1fh7tun2ojlj4Paul