How to calculate call duration using java card API

Question

Hi,
I am developing an application using Java card API. I want to calculate duration of otgoing calls in it. I am trying to start timer at the beginning of call in Call Control event. Can someone kindly check following code of Call control event? Here timerManagement function is sending proactive command for starting timer for 3 hours. Here I am asuming that maximum call will be of 3 hours. In callDisconnect event i can get current value of timer and use it to calculate duration of call. But this scenario is also not working.
Problem is that during code execution program stuck at send command (proHdlr.send();) of timmerManagement function. I am sending postAsBERTLV command before starting timer so may be reason is that it is not possible to send proactive command while phone is busy.
But I also cannot send postAsBERTLV after timerManagement function. Because it is mention in specification that "The EnvelopeResponseHandler content must be posted before the first invocation of a ProactiveHandler.send method or before the termination of the processToolkit, so that the GSM applet can offer these data to the ME (eg 9Fxx/9Exx/91xx). After the first invocation of the ProactiveHandler.send method the EnvelopeResponseHandler is no more available"
Take a look at following code
                 * Method illustrating the use of the Call Control event.
                private void callControlService() {
                                /** @todo: Replace following sample code with your implementation */
                                ProactiveHandler proHdlr = ProactiveHandler.getTheHandler();
                                EnvelopeHandler envHdlr = EnvelopeHandler.getTheHandler();
                                ProactiveResponseHandler rspHdlr = ProactiveResponseHandler
                                                                .getTheHandler();
                                EnvelopeResponseHandler envRspHdlr = EnvelopeResponseHandler
                                                                .getTheHandler();
                                durationCount = 0;
                                 // allow call with no modifications
                                envRspHdlr.postAsBERTLV((byte)0x9F, (byte)0x00);
                                // start clock using timer
                                timerManagement(proHdlr, rspHdlr, (byte) 0x0, timer_id, tempBuffer);
                                return;
                }Please help me in this regard
Thanks
Yasir

Answer 1

I am also unable to start timer in call connected event. I cannot send any proactive command while phone is busy. I am using Gemalto development Suite and there simulators (Simulation 2G chain).
Is it limitation of simulator that you cannot send any proactive command while phone is busy?
Is there any other work around for getting call duration?