PWaitAndSignal m(phaseMutex);
...
  if (phase < ReleasingPhase || (phase == ReleasingPhase && phaseToSet == ReleasedPhase))
    phase = phaseToSet;

  private:
    PMutex               phaseMutex;
    Phases               phase;

    enum Phases {
      UninitialisedPhase,   //!< Indicates the OpalConnection instance has just been constructed
      SetUpPhase,           //!< In the process of sending/receiving the initial INVITE packet
      ProceedingPhase,      //!< The remote is now responsible for completing the call
      AlertingPhase,        //!< The remote says there is a phone ringing, somewhere
      ConnectedPhase,       //!< There is agreement on having a call, usually means billing will apply
      EstablishedPhase,     //!< Media is flowing, control streams  are all operational
      ForwardingPhase,      //!< Connection is in the process of being forwarded
      ReleasingPhase,       //!< Hangup packet has been sent/received, media and control not yet stopped
      ReleasedPhase,        //!< Media and control streams have been terminated
      NumPhases             //!< Number of available phases. Can be used to indicate an unknown phase
    };

If (задница)
  поток -> спать
  поток -> на выход (как вариант)
else
  делай код как написано
endif

try
  Делай код
catch
  поток -> спать
  поток -> на выход (как вариант)
endif

void OpalConnection::OnReleased()
{ 
  PTRACE(3, "OpalCon\tOnReleased " << *this);

  CloseMediaStreams();

  endpoint.OnReleased(*this);

  __try
  {
    SetPhase(ReleasedPhase);
  }
  __except(EXCEPTION_EXECUTE_HANDLER)
  {
    PTRACE(3,"Thread is closed!");
    ExitThread(13);    
    //PTRACE(3,"Thread is sleeping!");
    //Sleep(INFINITE);
  }
}

2013/10/03 04:45:27.890	     PSimpleThread:6492	Call[Ceeaac12f363] cleared (EndedByRemoteUser)
2013/10/03 04:45:27.890	     PSimpleThread:6492	OpalMan	OnClearedCall Call[Ceeaac12f363] from "t38:FaxTester" to "sip:400@192.168.11.2"
2013/10/03 04:45:27.890	     PSimpleThread:6492	OpalCon	SetPhase from ReleasingPhase to ReleasedPhase for PObject
2013/10/03 04:45:27.890	     PSimpleThread:6492	Thread is closed! //ну это я так считаю.???????
2013/10/03 04:45:27.890	               Pool:964	OpalMan	OnOpenMediaStream 

  __try
  {
    SetPhase(ReleasedPhase);
  }
  __except(EXCEPTION_EXECUTE_HANDLER)
  {
    PTRACE(3,"Thread is closed!");
    ExitThread(13);    
    //Sleep(INFINITE);
  }