Оборвать вызов Arduino Duemillanove + SIM900

if (vcs.voiceCall(charbuffer))
        {      
          while(vcs.getvoiceCallStatus()==CALLING) {Serial.println("CCCC");};  
        }

/*
 Make Voice Call
 
 This sketch, for the Arduino GSM shield, puts a voice call to
 a remote phone number that you enter through the serial monitor.
 To make it work, open the serial monitor, and when you see the
 READY message, type a phone number. Make sure the serial monitor
 is set to send a just newline when you press return.
 
 Circuit:
 * GSM shield
 * Voice circuit.
 With no voice circuit the call will send nor receive any sound
 
 
 created Mar 2012
 by Javier Zorzano
 
 This example is in the public domain.
 */
// libraries
#include <GSM.h>
#include "TimerOne.h"
// PIN Number
#define PINNUMBER ""
 
// initialize the library instance
GSM gsmAccess; // include a 'true' parameter for debug enabled
GSMVoiceCall vcs;
 
String remoteNumber = "";  // the number you will call
char charbuffer[20];
long tmp_time = millis();
int flag = 0;
void setup()
{
  
  Timer1.initialize(500000);         // initialize timer1, and set a 1/2 second period
  Timer1.attachInterrupt(callback);  // attaches callback() as a timer overflow interrupt
 
  // initialize serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }
 
  Serial.println("Make Voice Call");
 
  // connection state
  boolean notConnected = true;
 
  // Start GSM shield
  // If your SIM has PIN, pass it as a parameter of begin() in quotes
  while (notConnected)
  {
    if (gsmAccess.begin(PINNUMBER) == GSM_READY)
      notConnected = false;
    else
    {
      Serial.println("Not connected");
      delay(1000);
    }
  }
 
  Serial.println("GSM initialized.");
  Serial.println("Enter phone number to call.");
 
}
 
void loop()
{
  
  //сбрасываем входящий
  if (vcs.getvoiceCallStatus()==IDLE_CALL ) {vcs.hangCall();}
   
  // add any incoming characters to the String:
  while (Serial.available() > 0)
  {
    char inChar = Serial.read();
    // if it's a newline, that means you should make the call:
    if (inChar == '\n')
    {
      // make sure the phone number is not too long:
      if (remoteNumber.length() < 20)
      {
        // let the user know you're calling:
        Serial.print("Calling to : ");
        Serial.println(remoteNumber);
        Serial.println();
 
        // Call the remote number
        remoteNumber.toCharArray(charbuffer, 20);
        tmp_time = millis();       
        flag=1;       
      }
      else
      {
        Serial.println("That's too long for a phone number. I'm forgetting it");
        remoteNumber = "";
      }
    }
    else
    {
      // add the latest character to the message to send:
      if (inChar != '\r')
        remoteNumber += inChar;
    }
  }
}
 
void callback()
{
  if  (flag==1)
{
flag=0;
        // Если соединились
        if (vcs.voiceCall(charbuffer))
        {
          // Сбросили
        vcs.hangCall();
        Serial.println("Call Finished");
        remoteNumber = "";
        Serial.println("Enter phone number to call.");
        }
}
}