Transfer the call to a SWML endpoint. The aiResponse text is injected into
the call flow via a SWML set verb before the transfer executes.
For simple phone-number or SIP transfers, use connect() instead.
Use swmlTransfer() when you need to hand off to another SWML document and
set up a return message.
Destination URL for the transfer (a SWML endpoint, SIP address, etc.).
Text injected as ai_response via a SWML set verb before the transfer
executes.
Whether this is a permanent transfer (true) or temporary (false).
FunctionResult — this, for chaining.