diff --git a/lib/NGCP/BulkProcessor/Dao/Trunk/provisioning/voip_preferences.pm b/lib/NGCP/BulkProcessor/Dao/Trunk/provisioning/voip_preferences.pm
index 6cbe3ec..3665832 100644
--- a/lib/NGCP/BulkProcessor/Dao/Trunk/provisioning/voip_preferences.pm
+++ b/lib/NGCP/BulkProcessor/Dao/Trunk/provisioning/voip_preferences.pm
@@ -68,6 +68,8 @@ our @EXPORT_OK = qw(
     $SOUND_SET_ATTRIBUTE
     $CONTRACT_SOUND_SET_ATTRIBUTE
     $HEADER_RULE_SET_ATTRIBUTE
+
+    $BOOLEAN_DATA_TYPE
 );
 #$FORCE_OUTBOUND_CALLS_TO_PEER
 
@@ -144,6 +146,8 @@ our $SOUND_SET_ATTRIBUTE = 'sound_set';
 our $CONTRACT_SOUND_SET_ATTRIBUTE = 'contract_sound_set';
 our $HEADER_RULE_SET_ATTRIBUTE = 'header_rule_set';
 
+our $BOOLEAN_DATA_TYPE = 'boolean';
+
 sub new {
 
     my $class = shift;
@@ -224,6 +228,14 @@ sub has_enum_default {
     return 0;
 }
 
+sub is_boolean {
+    my $self = shift;
+    if ($self->{data_type} eq $BOOLEAN_DATA_TYPE) {
+        return 1;
+    }
+    return 0;
+}
+
 sub gettablename {
 
     return $tablename;