DUM Ending an Invite Session

• To send a CANCEL to cancel for a UAC INVITE (for which a dialog creating response has NOT yet been recieved) and cancel all potential legs of the invite - use the AppDialogSet::end() or AppDialogSet::endCommand() call.
• To send a BYE for one particular leg of an early UAC INVITE (for which a 200 response has NOT yet been recieved) - use the InviteSessionHandle->end() call.

 WARNING - sending a BYE to an early dialog, does not cancel the original Invite Transaction 
         - if you are done with the invite entirely, then you MUST call AppDialogSet::end() 
           in order to properly dispose of the invite transaction state to avoid memory leaks

• To send a BYE for an established Invite Session (for which a 200 response has been recieved) - use the InviteSessionHandle->end() call.