This FSM sends an incoming INVITE to a vxml resource as specified
in sip.xml deployment descriptor via vxmlScript and vxmlServer parameters.
The vxml script can respond via a VxmlRedirectBean on a NonSipPort
with the following options:
action = Action.CONTINUE : continue call to original address
action = Action.UPDATE : update address(es) and continue call
action = Action.NEW : instruct app router to place new call
action = Action.TEARDOWN : tear down call
For Action.UPDATE, new source or target address can be specified.
If not specified, then no change is made to that address.
For Action.CONTINUE or Action.UPDATE, additional headers will be
set in the outgoing INVITE based on source and target supplied
in the VxmlRedirectBean.