HELP: How I Detection The Number ID Caller To GSM SIM900?

Hi…

I Have GSM SIM900, and i want to know the number id caller’ if the thier the specific number, then the gsm pickup…

i have this code, and wont to repair this to detection the number that calling:

#include “SIM900.h”
#include <SoftwareSerial.h>
#include “call.h”

CallGSM call;
SoftwareSerial SIM900(7, 8);

void setup()
{
pinMode(10,OUTPUT);
Serial.begin(9600);

if (gsm.begin(9600))
{
Serial.println("\nstatus=READY");
}
else
Serial.println("\nstatus=IDLE");
}

void loop()
{
if (call.CallStatus() == CALL_INCOM_VOICE) // Yes! Someone is calling us
{
call.PickUp();
delay(5000);
call.HangUp();
}
}

any help ??? please …

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