diff --git a/apps/voip/3cx/restapi/custom/api.pm b/apps/voip/3cx/restapi/custom/api.pm
index 59b8cc955..f7a77a93e 100644
--- a/apps/voip/3cx/restapi/custom/api.pm
+++ b/apps/voip/3cx/restapi/custom/api.pm
@@ -221,6 +221,34 @@ sub request_api {
     return $decoded;
 }
 
+sub internal_activecalls {
+    my ($self, %options) = @_;
+    
+    my $status = $self->request_api(method => 'GET', url_path =>'/api/activeCalls');
+    return $status;
+}
+
+sub api_activecalls {
+    my ($self, %options) = @_;
+
+    my $status = $self->internal_activecalls();
+    return $status->{list};
+}
+
+sub internal_extension_list {
+    my ($self, %options) = @_;
+    
+    my $status = $self->request_api(method => 'GET', url_path =>'/api/ExtensionList');
+    return $status;
+}
+
+sub api_extension_list {
+    my ($self, %options) = @_;
+
+    my $status = $self->internal_extension_list();
+    return $status->{list};
+}
+
 sub internal_single_status {
     my ($self, %options) = @_;
 
diff --git a/apps/voip/3cx/restapi/mode/extension.pm b/apps/voip/3cx/restapi/mode/extension.pm
new file mode 100644
index 000000000..4b4405582
--- /dev/null
+++ b/apps/voip/3cx/restapi/mode/extension.pm
@@ -0,0 +1,171 @@
+#
+# Copyright 2019 Centreon (http://www.centreon.com/)
+#
+# Centreon is a full-fledged industry-strength solution that meets
+# the needs in IT infrastructure and application monitoring for
+# service performance.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+package apps::voip::3cx::restapi::mode::extension;
+
+use base qw(centreon::plugins::templates::counter);
+
+use strict;
+use warnings;
+use centreon::plugins::templates::catalog_functions qw(catalog_status_threshold);
+
+sub custom_status_output { 
+    my ($self, %options) = @_;
+
+    my $msg = '';
+    if ($self->{result_values}->{registered} eq 'true') {
+        $msg .= 'registered';
+    } else {
+        $msg .= 'unregistered';
+    }
+    if ($self->{result_values}->{dnd} eq 'true') {
+        $msg .= ', in DND';
+    } else {
+        $msg .= ', not in DND';
+    }
+    $msg .= ', ' . $self->{result_values}->{profile};
+    if ($self->{result_values}->{status} ne '') {
+        $msg .= ', ' . $self->{result_values}->{status};
+        $msg .= ' since ' . sprintf '%02dh %02dm %02ds', (gmtime($self->{result_values}->{duration}))[2,1,0];
+    }
+    return $msg;
+}
+
+sub custom_status_calc {
+    my ($self, %options) = @_;
+
+    $self->{result_values}->{extension} = $options{new_datas}->{$self->{instance} . '_extension'};
+    $self->{result_values}->{registered} = $options{new_datas}->{$self->{instance} . '_registered'};
+    $self->{result_values}->{dnd} = $options{new_datas}->{$self->{instance} . '_dnd'};
+    $self->{result_values}->{profile} = $options{new_datas}->{$self->{instance} . '_profile'};
+    $self->{result_values}->{status} = $options{new_datas}->{$self->{instance} . '_status'};
+    $self->{result_values}->{duration} = $options{new_datas}->{$self->{instance} . '_duration'};
+    return 0;
+}
+
+sub set_counters {
+    my ($self, %options) = @_;
+
+    $self->{maps_counters_type} = [
+        { name => 'global', type => 0 },
+        { name => 'extension', type => 1, cb_prefix_output => 'prefix_service_output', message_multiple => 'All extensions are ok', skipped_code => { -10 => 1 } }
+    ];
+
+    $self->{maps_counters}->{extension} = [
+        { label => 'status', threshold => 0, set => {
+                key_values => [ { name => 'extension' }, { name => 'registered' }, { name => 'dnd' }, { name => 'profile' }, { name => 'status' }, { name => 'duration' } ],
+                closure_custom_calc => $self->can('custom_status_calc'),
+                closure_custom_output => $self->can('custom_status_output'),
+                closure_custom_perfdata => sub { return 0; },
+                closure_custom_threshold_check => \&catalog_status_threshold,
+            }
+        },
+    ];
+}
+
+sub prefix_service_output {
+    my ($self, %options) = @_;
+
+    return "Extension '" . $options{instance_value}->{extension} ."' ";
+}
+
+sub new {
+    my ($class, %options) = @_;
+    my $self = $class->SUPER::new(package => __PACKAGE__, %options, force_new_perfdata => 1);
+    bless $self, $class;
+
+    $self->{version} = '1.0';
+    $options{options}->add_options(arguments => {
+        "unknown-status:s"  => { name => 'unknown_status', default => '' },
+        "warning-status:s"  => { name => 'warning_status', default => '' },
+        "critical-status:s" => { name => 'critical_status', default => '' },
+    });
+
+    return $self;
+}
+
+sub check_options {
+    my ($self, %options) = @_;
+    $self->SUPER::check_options(%options);
+
+    $self->change_macros(macros => [
+        'warning_status', 'critical_status', 'unknown_status',
+    ]);
+}
+
+sub manage_selection {
+    my ($self, %options) = @_;
+
+    my %status;
+    my $activecalls = $options{custom}->api_activecalls();
+    foreach my $item (@$activecalls) {
+        $status{$item->{Caller}} = {
+            Status => $item->{Status},
+            Duration => $item->{Duration},
+        };
+        $status{$item->{Callee}} = {
+            Status => $item->{Status},
+            Duration => $item->{Duration},
+        };
+    }
+
+    my $extension = $options{custom}->api_extension_list();
+    $self->{extension} = {};
+    foreach my $item (@$extension) {
+        $self->{extension}->{$item->{_str}} = {
+            extension => $item->{_str},
+            registered => $item->{IsRegistered} ? 'true' : 'false',
+            dnd => $item->{DND} ? 'true' : 'false',
+            profile => $item->{CurrentProfile},
+            status => $status{$item->{_str}}->{Status} ? $status{$item->{_str}}->{Status} : '',
+            duration => $status{$item->{_str}}->{Duration} &&
+                        $status{$item->{_str}}->{Duration} =~ /(\d\d):(\d\d):(\d\d).*/ ? $1*3600+$2*60+$3 : 0,
+        };
+    }
+}
+
+1;
+
+__END__
+
+=head1 MODE
+
+Check system health
+
+=over 8
+
+=item B<--unknown-status>
+
+Set unknown threshold for status.
+Can used special variables like: %{extension}, %{registered}, %{dnd}, %{profile}, %{status}, %{duration}
+
+=item B<--warning-status>
+
+Set warning threshold for status.
+Can used special variables like: %{extension}, %{registered}, %{dnd}, %{profile}, %{status}, %{duration}
+
+=item B<--critical-status>
+
+Set critical threshold for status.
+Can used special variables like: %{extension}, %{registered}, %{dnd}, %{profile}, %{status}, %{duration}
+
+=back
+
+=cut
diff --git a/apps/voip/3cx/restapi/plugin.pm b/apps/voip/3cx/restapi/plugin.pm
index 0bf65c482..3f2de0f1f 100644
--- a/apps/voip/3cx/restapi/plugin.pm
+++ b/apps/voip/3cx/restapi/plugin.pm
@@ -32,6 +32,7 @@ sub new {
 
     $self->{version} = '1.0';
     %{$self->{modes}} = (
+        'extension' => 'apps::voip::3cx::restapi::mode::extension',
         'system'    => 'apps::voip::3cx::restapi::mode::system',
     );
 
@@ -45,7 +46,7 @@ __END__
 
 =head1 PLUGIN DESCRIPTION
 
-Check 3CX ressources through its HTTPS remote API.
+Check 3CX extensions through its HTTPS remote API.
 
 Requirements: at least 3CX 15.5.