diff --git a/lib/NGCP/Panel/Form/Customer/PbxFieldDeviceAPI.pm b/lib/NGCP/Panel/Form/Customer/PbxFieldDeviceAPI.pm
index 628c7482ca..611e69eee4 100644
--- a/lib/NGCP/Panel/Form/Customer/PbxFieldDeviceAPI.pm
+++ b/lib/NGCP/Panel/Form/Customer/PbxFieldDeviceAPI.pm
@@ -100,6 +100,16 @@ has_field 'lines.type' => (
     element_class => [qw/ngcp-linetype-select/],
 );
 
+has_field 'lines.target_number' => (
+    type => 'Text',
+    required => 1,
+    label => 'Linerange',
+    element_attr => {
+        rel => ['tooltip'],
+        title => ['The target number.'],
+    },
+);
+
 has_field 'lines.deviceid_number_id' => (
     type => '+NGCP::Panel::Field::PosInteger',
     required => 0,
diff --git a/lib/NGCP/Panel/Role/API/PbxDevices.pm b/lib/NGCP/Panel/Role/API/PbxDevices.pm
index 6c1a19a4a6..249e536fcc 100644
--- a/lib/NGCP/Panel/Role/API/PbxDevices.pm
+++ b/lib/NGCP/Panel/Role/API/PbxDevices.pm
@@ -217,6 +217,11 @@ sub update_item {
 
         $line->{line_type} = delete $line->{type};
 
+        if (defined $line->{target_number} && $line->{target_number} !~ /^[0-9#*]+$/) {
+            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Invalid 'target_number' ($line->{target_number}), can contain only '0-9' numbers and '#','*' characters");
+            return;
+        }
+
         if($oldline) {
             $oldline->update($line);
         } else {