function pointer problem

I have a singleton class Modem

namespace Proxy
{

Modem
{
....
static Modem* Instance();

Intf::ModemAlarmStatusRespMsg *GetAlarmStatusRespMsg(){return
&m_alarmStatusResp;}

....

}

};

class BaseModemAlarm:public BaseAlarm
{

    public:

    BaseModemAlarm(){};
    BaseModemAlarm(const ut_int32 AlarmId){};

    Intf::ModemOffOnEnum (*funcField)();

    private:
   //MemFunc funcField;

    ut_int32 AlarmId;
    // method
    int GetRefValue(){return static_cast<int> (Intf::MOD_ON);};
    int GetStatusValue(){ return static_cast<int> ( (*funcField)
() ); };
};

// in constructor of another class I would like build a instance of
BaseModemAlarm passing
a member function.

ModemAlarmHandler::ModemAlarmHandler()
{
    BaseModemAlarm Alarm_OlBitePll(Intf::MODEM_OL_BITE_PLL_ALARM);
    Intf::ModemAlarmStatusRespMsg * msg=Proxy::Modem::Instance-


   Alarm_OlBitePll.funcField=&(msg->GetOlBitePllAlarm);

};

I would like access to msg->GetOlBitePllAlarm() at runtime from
Alarm_OlBitePll instance.
I get a compiler error. I can't access directly to
ModemAlarmStatusRespMsg fields beacuse they are declare as private and
I can't modify the class definition.

I need to declare several different instance of BaseModemAlarm and for
every instance I should call a different method for msg object.
Please help me.

Ale.