diff --git a/Layout/default/Invoice/Index.php b/Layout/default/Invoice/Index.php
index 5f269cc04..32fcff61e 100644
--- a/Layout/default/Invoice/Index.php
+++ b/Layout/default/Invoice/Index.php
@@ -342,7 +342,8 @@ $pagination_entity_name = "Rechnungen";
                                         <td><?=($invoice->billing_type == "sepa") ? "SEPA" : "Überweisung"?></td>
                                         <td><?=($invoice->billing_delivery == "email") ? "Email" : "Papier"?></td>
                                         <td>
-                                            <a href="<?=self::getUrl("Invoice", "downloadInvoiceCsv", ["id" => $invoice->id])?>" title="CSV-Download"><i class="fas fa-file-csv fa-fw"></i></a>
+                                            <a href="<?=self::getUrl("Invoice", "downloadInvoiceCsv", ["id" => $invoice->id])?>" title="CSV-Download"><i class="far fa-file-csv fa-fw"></i></a>
+                                            <a href="<?=self::getUrl("Invoice", "downloadInvoiceVoiceDetails", ["id" => $invoice->id])?>" title="CSV-Download"><i class="far fa-square-phone-flip fa-fw ml-2"></i></a>
                                         </td>
                                     </tr>
                                 <?php endforeach; ?>
diff --git a/application/Invoice/InvoiceController.php b/application/Invoice/InvoiceController.php
index 1871ffd2e..f860ed672 100644
--- a/application/Invoice/InvoiceController.php
+++ b/application/Invoice/InvoiceController.php
@@ -212,6 +212,112 @@ class InvoiceController extends mfBaseController {
         exit;
     }
 
+    protected function downloadInvoiceVoiceDetailsAction() {
+        $id = $this->request->id;
+        if (!is_numeric($id) || !$id) {
+            $this->layout()->setFlash("Rechnung nicht gefunden", "error");
+            $this->redirect("Invoice");
+        }
+
+        $invoice = new Invoice($id);
+        if (!$invoice->id) {
+            $this->layout()->setFlash("Rechnung nicht gefunden", "error");
+            $this->redirect("Invoice");
+        }
+
+        $csv = "Startzeit;Abgehende Nummer;Zielnummer;Zone;Dauer;Kosten\n";
+
+        $destinations_cache = [];
+
+        foreach($invoice->voicenumbers as $voicenumber) {
+            $start_date = new DateTime($voicenumber->start_date);
+            //$start_date->setTimezone(new DateTimeZone("Europe/Vienna"));
+            $start_date->setTime(0,0,0);
+            $end_date = new DateTime($voicenumber->end_date);
+            //$end_date->setTimezone(new DateTimeZone("Europe/Vienna"));
+            $end_date->setTime(23,59,59);
+
+            foreach(VoiceCallHistoryModel::getVoiceCallHistoryAsEntity([
+                "voice_account" => $voicenumber->voicenumber,
+                "start" => [
+                    "from" => $start_date->getTimestamp(),
+                    "to" => $end_date->getTimestamp()
+                ],
+                "billable" => 1,
+            ], null, 0, ["key" => "start", "order" => "ASC"]) as $call) {
+                if(!$call->contract_id) continue;
+
+                //$voiceplan = new Voiceplan($voicenumber->voiceplan_id);
+                $voiceplan = VoiceplanModel::getFirst(["name" => $voicenumber->voiceplan]);
+                if(!$voiceplan) {
+                    $this->log->warning(__METHOD__.": Voiceplan not found");
+                };
+
+                $number = $voicenumber->voicenumber;
+                $dest_nummer = $call->destination;
+                if (substr($dest_nummer, 0, 2) == "00") {
+                    $dest_nummer = substr($dest_nummer, 2);
+                }
+
+                if (substr($dest_nummer, 0, 1) == "+") {
+                    $dest_nummer = substr($dest_nummer, 1);
+                }
+
+                if (array_key_exists($dest_nummer, $destinations_cache)) {
+                    $destination = $destinations_cache[$dest_nummer];
+                } else {
+                    $destination = $voiceplan->getDestinationByNumber($dest_nummer);
+                    if (!$destination) {
+                        die("Destination für Zielrufnummer " . $call->destination . " nicht gefunden");
+                    }
+                    $destinations_cache[$dest_nummer] = $destination;
+                }
+                //var_dump($destination);
+
+                $zone = $destination->voiceplanzone;
+
+                if (!$zone) {
+                    die("Keine Zone für Destination " . $dest_nummer . " gefunden");
+                }
+
+                //var_dump($zone);exit;
+
+                // inc_first - first minimumm duration to bill
+                // inc - subsequent minimum duration to bill
+                $inc_first = $zone->increment_first;
+                $inc = $zone->increment;
+
+                $billable_duration = $call->duration;
+                if ($billable_duration <= 0) continue;
+
+                // calculate price of first duration unit
+                // then subtract first minimum duration from duration
+                $sec_price = $zone->price / 60;
+                $call_price = $inc_first * $sec_price;
+                $billable_duration -= $inc_first;
+
+                // calculate price of remaining duration and make sure to bill in full duration units
+                if ($billable_duration > 0) {
+                    $multi = ceil($billable_duration / $inc);
+                    $call_price += ($multi * $inc) * $sec_price;
+                }
+
+                $csv .= '"'.$call->start.'";';
+                $csv .= '"'.$call->source.'"; ';
+                $csv .= '"'.$call->destination.'"; ';
+                $csv .= '"'.$zone->name.'"; ';
+                $csv .= $call->duration.'; ';
+                $csv .= '"'.str_replace(".",",", $call_price).'"';
+                $csv .= "\n";
+            }
+
+        }
+
+        header("Content-type: text/csv; charset=utf-8");
+        header('Content-disposition: attachment; filename="'.$invoice->invoice_number.'-egn.csv"');
+        echo $csv;
+        exit;
+    }
 
     protected function createJob() {
         $r = $this->request;