deferred test flag. Options: 1. immediatetest(1) -indicates immediate test; 2. deferredtest(2) -indicates deferred test: Initiated when the port is in service. If the port is busy, the test operation will be deferred. If the port changes to idle state before time out, the test will be executed immediately. If the port keeps busy by the time out, the system will excecute a corresponding operation according to what the user specified: canceling the test or forcing to test. If the value of this leaf node is deferredtest(2), both hwISDNDiagnoseTestDeferredTime and hwISDNDiagnoseTestTimeoutProc must be set. Only line diagnose test supports deferred test. default test flag: immediatetest(1). Default: immediatetest(1)