function IPVoicePriceCalculator() {
  this.clipMonthlyPrice =  0;
  this.clipYearlyPrice =  0;
  this.clipOneTimePrice =  0;
  this.durchMonthlyPrice =  0;
  this.durchYearlyPrice =  0;
  this.durchOneTimePrice =  0;
  this.shortBy1MonthlyPrice =  0;
  this.shortBy1YearlyPrice =  0;
  this.shortBy1OneTimePrice =  0;
  this.shortBy2MonthlyPrice =  0;
  this.shortBy2YearlyPrice =  0;
  this.shortBy2OneTimePrice =  0;
  this.phoneNumbers = [  ];

  this.recalculate = function(phoneIndex, isDurch, isClip, shortCharge) {

    if(!Boolean(this.phoneNumbers[phoneIndex])) {
      phoneIndex = 0;
    }
    var monthlyPrice = this.phoneNumbers[phoneIndex].monthly;
    var yearlyPrice = this.phoneNumbers[phoneIndex].yearly;
    var oneTimePrice = this.phoneNumbers[phoneIndex].oneTime;
    if (Boolean(isClip)) {
        monthlyPrice += this.clipMonthlyPrice;
        yearlyPrice += this.clipYearlyPrice;
        oneTimePrice += this.clipOneTimePrice;
      }
    if (Boolean(isDurch)) {
      monthlyPrice += this.durchMonthlyPrice;
      yearlyPrice += this.durchYearlyPrice;
      oneTimePrice += this.durchOneTimePrice;
    }
      const $vc30 = $('#SPO_IP_VOICE_VOICE_CHANNELS_30SK_2021');
      if (!Boolean($vc30) || !$vc30.is(':checked')) {
        if ('ONE' === shortCharge) {
          monthlyPrice += this.shortBy1MonthlyPrice;
          yearlyPrice += this.shortBy1YearlyPrice;
          oneTimePrice += this.shortBy1OneTimePrice;
        }
        if ('TWO' === shortCharge) {
          monthlyPrice += this.shortBy2MonthlyPrice;
          yearlyPrice += this.shortBy2YearlyPrice;
          oneTimePrice += this.shortBy2OneTimePrice;
        }
      }
    phoneIndex += 1;

    document.getElementById("monthlyPrice" + phoneIndex).innerHTML = "€ " + this.formatNumber(monthlyPrice);
    document.getElementById("yearlyPrice" + phoneIndex).innerHTML = "€ " +  this.formatNumber(yearlyPrice);
    document.getElementById("oneTimePrice" + phoneIndex).innerHTML = "€ " + this.formatNumber(oneTimePrice);
  }
  this.formatNumber = function(value) {
    return value.toLocaleString('de-DE', {minimumFractionDigits: 2, maximumFractionDigits: 2});
  }
}