diff --git a/cli/mmcli-modem-voice.c b/cli/mmcli-modem-voice.c
index e1f1426a..dac650dd 100644
--- a/cli/mmcli-modem-voice.c
+++ b/cli/mmcli-modem-voice.c
@@ -52,6 +52,7 @@ static gchar *create_str;
 static gchar *delete_str;
 static gboolean hold_and_accept_flag;
 static gboolean hangup_and_accept_flag;
+static gboolean hangup_all_flag;
 
 static GOptionEntry entries[] = {
     { "voice-list-calls", 0, 0, G_OPTION_ARG_NONE, &list_flag,
@@ -74,6 +75,10 @@ static GOptionEntry entries[] = {
       "Hangs up all active calls and accepts the next waiting or held call",
       NULL
     },
+    { "voice-hangup-all", 0, 0, G_OPTION_ARG_NONE, &hangup_all_flag,
+      "Hangs up all ongoing (active, waiting, held) calls",
+      NULL
+    },
     { NULL }
 };
 
@@ -105,7 +110,8 @@ mmcli_modem_voice_options_enabled (void)
                  !!create_str +
                  !!delete_str +
                  hold_and_accept_flag +
-                 hangup_and_accept_flag);
+                 hangup_and_accept_flag +
+                 hangup_all_flag);
 
     if (n_actions > 1) {
         g_printerr ("error: too many Voice actions requested\n");
@@ -187,6 +193,31 @@ output_call_info (MMCall *call)
     g_free (extra);
 }
 
+static void
+hangup_all_process_reply (const GError *error)
+{
+    if (error) {
+        g_printerr ("error: couldn't hangup all: '%s'\n",
+                    error->message);
+        exit (EXIT_FAILURE);
+    }
+
+    g_print ("operation successful\n");
+}
+
+static void
+hangup_all_ready (MMModemVoice *modem,
+                  GAsyncResult *result,
+                  gpointer     nothing)
+{
+    GError *error = NULL;
+
+    mm_modem_voice_hangup_all_finish (modem, result, &error);
+    hangup_all_process_reply (error);
+
+    mmcli_async_operation_done ();
+}
+
 static void
 hangup_and_accept_process_reply (const GError *error)
 {
@@ -416,6 +447,16 @@ get_modem_ready (GObject      *source,
         return;
     }
 
+    /* Request to hangup all? */
+    if (hangup_all_flag) {
+        g_debug ("Asynchronously hanging up all calls...");
+        mm_modem_voice_hangup_all (ctx->modem_voice,
+                                   ctx->cancellable,
+                                   (GAsyncReadyCallback)hangup_all_ready,
+                                   NULL);
+        return;
+    }
+
     g_warn_if_reached ();
 }
 
@@ -528,5 +569,13 @@ mmcli_modem_voice_run_synchronous (GDBusConnection *connection)
         return;
     }
 
+    /* Request to hangup all? */
+    if (hangup_all_flag) {
+        g_debug ("Synchronously hanging up all calls...");
+        mm_modem_voice_hangup_all_sync (ctx->modem_voice, NULL, &error);
+        hangup_all_process_reply (error);
+        return;
+    }
+
     g_warn_if_reached ();
 }
diff --git a/docs/reference/libmm-glib/libmm-glib-sections.txt b/docs/reference/libmm-glib/libmm-glib-sections.txt
index a2087f38..be0bdcfe 100644
--- a/docs/reference/libmm-glib/libmm-glib-sections.txt
+++ b/docs/reference/libmm-glib/libmm-glib-sections.txt
@@ -1018,6 +1018,9 @@ mm_modem_voice_hangup_and_accept_sync
 mm_modem_voice_hold_and_accept
 mm_modem_voice_hold_and_accept_finish
 mm_modem_voice_hold_and_accept_sync
+mm_modem_voice_hangup_all
+mm_modem_voice_hangup_all_finish
+mm_modem_voice_hangup_all_sync
 <SUBSECTION Standard>
 MMModemVoiceClass
 MMModemVoicePrivate
@@ -2847,6 +2850,9 @@ mm_gdbus_modem_voice_call_hangup_and_accept_sync
 mm_gdbus_modem_voice_call_hold_and_accept
 mm_gdbus_modem_voice_call_hold_and_accept_finish
 mm_gdbus_modem_voice_call_hold_and_accept_sync
+mm_gdbus_modem_voice_call_hangup_all
+mm_gdbus_modem_voice_call_hangup_all_finish
+mm_gdbus_modem_voice_call_hangup_all_sync
 <SUBSECTION Private>
 mm_gdbus_modem_voice_set_calls
 mm_gdbus_modem_voice_emit_call_added
@@ -2856,6 +2862,7 @@ mm_gdbus_modem_voice_complete_delete_call
 mm_gdbus_modem_voice_complete_list_calls
 mm_gdbus_modem_voice_complete_hangup_and_accept
 mm_gdbus_modem_voice_complete_hold_and_accept
+mm_gdbus_modem_voice_complete_hangup_all
 mm_gdbus_modem_voice_interface_info
 mm_gdbus_modem_voice_override_properties
 <SUBSECTION Standard>
diff --git a/introspection/org.freedesktop.ModemManager1.Modem.Voice.xml b/introspection/org.freedesktop.ModemManager1.Modem.Voice.xml
index b6c16f13..72674e61 100644
--- a/introspection/org.freedesktop.ModemManager1.Modem.Voice.xml
+++ b/introspection/org.freedesktop.ModemManager1.Modem.Voice.xml
@@ -99,6 +99,18 @@
     -->
     <method name="HangupAndAccept" />
 
+    <!--
+        HangupAll:
+
+        Hangup all active calls.
+
+        Depending on how the device implements the action, calls on
+        hold or in waiting state may also be terminated.
+
+        No error is returned if there are no ongoing calls.
+    -->
+    <method name="HangupAll" />
+
     <!--
         CallAdded:
         @path: Object path of the new call.
diff --git a/libmm-glib/mm-modem-voice.c b/libmm-glib/mm-modem-voice.c
index 8d86f718..bf3a5a6d 100644
--- a/libmm-glib/mm-modem-voice.c
+++ b/libmm-glib/mm-modem-voice.c
@@ -690,6 +690,85 @@ mm_modem_voice_hangup_and_accept_sync (MMModemVoice  *self,
 
 /*****************************************************************************/
 
+/**
+ * mm_modem_voice_hangup_all_finish:
+ * @self: A #MMModemVoice.
+ * @res: The #GAsyncResult obtained from the #GAsyncReadyCallback passed to mm_modem_voice_hangup_all().
+ * @error: Return location for error or %NULL.
+ *
+ * Finishes an operation started with mm_modem_voice_hangup_all().
+ *
+ * Returns: %TRUE if the operation was successful, %FALSE if @error is set.
+ * Since: 1.12
+ */
+gboolean
+mm_modem_voice_hangup_all_finish (MMModemVoice  *self,
+                                  GAsyncResult  *res,
+                                  GError       **error)
+{
+    g_return_val_if_fail (MM_IS_MODEM_VOICE (self), FALSE);
+
+    return mm_gdbus_modem_voice_call_hangup_all_finish (MM_GDBUS_MODEM_VOICE (self), res, error);
+}
+
+/**
+ * mm_modem_voice_hangup_all:
+ * @self: A #MMModemVoice.
+ * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @callback: A #GAsyncReadyCallback to call when the request is satisfied or %NULL.
+ * @user_data: User data to pass to @callback.
+ *
+ * Asynchronously hangs up all ongoing (active, waiting, held) calls.
+ *
+ * When the operation is finished, @callback will be invoked in the <link linkend="g-main-context-push-thread-default">thread-default main loop</link> of the thread you are calling this method from.
+ * You can then call mm_modem_voice_hangup_all_finish() to get the result of the operation.
+ *
+ * See mm_modem_voice_hangup_all_sync() for the synchronous, blocking version of this method.
+ *
+ * Since: 1.12
+ */
+void
+mm_modem_voice_hangup_all (MMModemVoice        *self,
+                           GCancellable        *cancellable,
+                           GAsyncReadyCallback  callback,
+                           gpointer             user_data)
+{
+    g_return_if_fail (MM_IS_MODEM_VOICE (self));
+
+    mm_gdbus_modem_voice_call_hangup_all (MM_GDBUS_MODEM_VOICE (self),
+                                          cancellable,
+                                          callback,
+                                          user_data);
+}
+
+/**
+ * mm_modem_voice_hangup_all_sync:
+ * @self: A #MMModemVoice.
+ * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @error: Return location for error or %NULL.
+ *
+ * Synchronously hangs up all ongoing (active, waiting, held) calls.
+ *
+ * The calling thread is blocked until a reply is received. See mm_modem_voice_hangup_all()
+ * for the asynchronous version of this method.
+ *
+ * Returns: %TRUE if the operation was successful, %FALSE if @error is set.
+ * Since: 1.12
+ */
+gboolean
+mm_modem_voice_hangup_all_sync (MMModemVoice  *self,
+                                GCancellable  *cancellable,
+                                GError       **error)
+{
+    g_return_val_if_fail (MM_IS_MODEM_VOICE (self), FALSE);
+
+    return mm_gdbus_modem_voice_call_hangup_all_sync (MM_GDBUS_MODEM_VOICE (self),
+                                                      cancellable,
+                                                      error);
+}
+
+/*****************************************************************************/
+
 static void
 mm_modem_voice_init (MMModemVoice *self)
 {
diff --git a/libmm-glib/mm-modem-voice.h b/libmm-glib/mm-modem-voice.h
index ebc2493f..0339c9bf 100644
--- a/libmm-glib/mm-modem-voice.h
+++ b/libmm-glib/mm-modem-voice.h
@@ -132,6 +132,17 @@ gboolean mm_modem_voice_hangup_and_accept_sync    (MMModemVoice        *self,
                                                    GCancellable        *cancellable,
                                                    GError             **error);
 
+void     mm_modem_voice_hangup_all         (MMModemVoice        *self,
+                                            GCancellable        *cancellable,
+                                            GAsyncReadyCallback  callback,
+                                            gpointer             user_data);
+gboolean mm_modem_voice_hangup_all_finish  (MMModemVoice        *self,
+                                            GAsyncResult        *res,
+                                            GError             **error);
+gboolean mm_modem_voice_hangup_all_sync    (MMModemVoice        *self,
+                                            GCancellable        *cancellable,
+                                            GError             **error);
+
 G_END_DECLS
 
 #endif /* _MM_MODEM_VOICE_H_ */
diff --git a/src/mm-iface-modem-voice.c b/src/mm-iface-modem-voice.c
index c3e0f677..e12d26ee 100644
--- a/src/mm-iface-modem-voice.c
+++ b/src/mm-iface-modem-voice.c
@@ -826,6 +826,161 @@ handle_hangup_and_accept (MmGdbusModemVoice     *skeleton,
     return TRUE;
 }
 
+/*****************************************************************************/
+
+typedef struct {
+    MmGdbusModemVoice     *skeleton;
+    GDBusMethodInvocation *invocation;
+    MMIfaceModemVoice     *self;
+    GList                 *calls;
+} HandleHangupAllContext;
+
+static void
+handle_hangup_all_context_free (HandleHangupAllContext *ctx)
+{
+    g_list_free_full (ctx->calls, g_object_unref);
+    g_object_unref (ctx->skeleton);
+    g_object_unref (ctx->invocation);
+    g_object_unref (ctx->self);
+    g_slice_free (HandleHangupAllContext, ctx);
+}
+
+static void
+hangup_all_ready (MMIfaceModemVoice      *self,
+                  GAsyncResult           *res,
+                  HandleHangupAllContext *ctx)
+{
+    GError *error = NULL;
+    GList  *l;
+
+    if (!MM_IFACE_MODEM_VOICE_GET_INTERFACE (self)->hangup_all_finish (self, res, &error)) {
+        g_dbus_method_invocation_take_error (ctx->invocation, error);
+        handle_hangup_all_context_free (ctx);
+        return;
+    }
+
+    for (l = ctx->calls; l; l = g_list_next (l))
+        mm_base_call_change_state (MM_BASE_CALL (l->data), MM_CALL_STATE_TERMINATED, MM_CALL_STATE_REASON_TERMINATED);
+
+    mm_gdbus_modem_voice_complete_hangup_all (ctx->skeleton, ctx->invocation);
+    handle_hangup_all_context_free (ctx);
+}
+
+static void
+prepare_hangup_all_foreach (MMBaseCall             *call,
+                            HandleHangupAllContext *ctx)
+{
+    /* The implementation of this operation will usually be done with +CHUP, and we
+     * know that +CHUP is implemented in different ways by different manufacturers.
+     *
+     * The 3GPP TS27.007 spec for +CHUP states that the "Execution command causes
+     * the TA to hangup the current call of the MT." This sentence leaves a bit of open
+     * interpretation to the implementors, because a current call can be considered only
+     * the active ones, or otherwise any call (active, held or waiting).
+     *
+     * And so, the u-blox TOBY-L4 takes one interpretation and "In case of multiple
+     * calls, all active calls will be released, while waiting and held calls are not".
+     *
+     * And the Cinterion PLS-8 takes a different interpretation and cancels all calls,
+     * including the waiting and held ones.
+     *
+     * In this logic, we're going to terminate exclusively the ACTIVE calls only, and we
+     * will leave the possible termination of waiting/held calls to be reported via
+     * call state updates, e.g. +CLCC polling or other plugin-specific method. In the
+     * case of the Cinterion PLS-8, we'll detect the termination of the waiting and
+     * held calls via ^SLCC URCs.
+     */
+    switch (mm_base_call_get_state (call)) {
+    case MM_CALL_STATE_DIALING:
+    case MM_CALL_STATE_RINGING_OUT:
+    case MM_CALL_STATE_RINGING_IN:
+    case MM_CALL_STATE_ACTIVE:
+        ctx->calls = g_list_append (ctx->calls, g_object_ref (call));
+        break;
+    case MM_CALL_STATE_WAITING:
+    case MM_CALL_STATE_HELD:
+    default:
+        break;
+    }
+}
+
+static void
+handle_hangup_all_auth_ready (MMBaseModem            *self,
+                              GAsyncResult           *res,
+                              HandleHangupAllContext *ctx)
+{
+    MMModemState  modem_state = MM_MODEM_STATE_UNKNOWN;
+    GError       *error = NULL;
+    MMCallList   *list = NULL;
+
+    if (!mm_base_modem_authorize_finish (self, res, &error)) {
+        g_dbus_method_invocation_take_error (ctx->invocation, error);
+        handle_hangup_all_context_free (ctx);
+        return;
+    }
+
+    g_object_get (self,
+                  MM_IFACE_MODEM_STATE, &modem_state,
+                  NULL);
+
+    if (modem_state < MM_MODEM_STATE_ENABLED) {
+        g_dbus_method_invocation_return_error (ctx->invocation,
+                                               MM_CORE_ERROR,
+                                               MM_CORE_ERROR_WRONG_STATE,
+                                               "Cannot hangup all: device not yet enabled");
+        handle_hangup_all_context_free (ctx);
+        return;
+    }
+
+    if (!MM_IFACE_MODEM_VOICE_GET_INTERFACE (self)->hangup_all ||
+        !MM_IFACE_MODEM_VOICE_GET_INTERFACE (self)->hangup_all_finish) {
+        g_dbus_method_invocation_return_error (ctx->invocation,
+                                               MM_CORE_ERROR,
+                                               MM_CORE_ERROR_UNSUPPORTED,
+                                               "Cannot hangup all: unsupported");
+        handle_hangup_all_context_free (ctx);
+        return;
+    }
+
+    g_object_get (self,
+                  MM_IFACE_MODEM_VOICE_CALL_LIST, &list,
+                  NULL);
+    if (!list) {
+        g_dbus_method_invocation_return_error (ctx->invocation,
+                                               MM_CORE_ERROR,
+                                               MM_CORE_ERROR_WRONG_STATE,
+                                               "Cannot hangup all: missing call list");
+        handle_hangup_all_context_free (ctx);
+        return;
+    }
+    mm_call_list_foreach (list, (MMCallListForeachFunc)prepare_hangup_all_foreach, ctx);
+    g_object_unref (list);
+
+    MM_IFACE_MODEM_VOICE_GET_INTERFACE (self)->hangup_all (MM_IFACE_MODEM_VOICE (self),
+                                                           (GAsyncReadyCallback)hangup_all_ready,
+                                                           ctx);
+}
+
+static gboolean
+handle_hangup_all (MmGdbusModemVoice     *skeleton,
+                   GDBusMethodInvocation *invocation,
+                   MMIfaceModemVoice     *self)
+{
+    HandleHangupAllContext *ctx;
+
+    ctx = g_slice_new0 (HandleHangupAllContext);
+    ctx->skeleton   = g_object_ref (skeleton);
+    ctx->invocation = g_object_ref (invocation);
+    ctx->self       = g_object_ref (self);
+
+    mm_base_modem_authorize (MM_BASE_MODEM (self),
+                             invocation,
+                             MM_AUTHORIZATION_VOICE,
+                             (GAsyncReadyCallback)handle_hangup_all_auth_ready,
+                             ctx);
+    return TRUE;
+}
+
 /*****************************************************************************/
 /* Call list polling logic
  *
@@ -1516,6 +1671,10 @@ interface_initialization_step (GTask *task)
                           "handle-hold-and-accept",
                           G_CALLBACK (handle_hold_and_accept),
                           self);
+        g_signal_connect (ctx->skeleton,
+                          "handle-hangup-all",
+                          G_CALLBACK (handle_hangup_all),
+                          self);
 
         /* Finally, export the new interface */
         mm_gdbus_object_skeleton_set_modem_voice (MM_GDBUS_OBJECT_SKELETON (self),
diff --git a/src/mm-iface-modem-voice.h b/src/mm-iface-modem-voice.h
index d5395741..612e170b 100644
--- a/src/mm-iface-modem-voice.h
+++ b/src/mm-iface-modem-voice.h
@@ -107,6 +107,14 @@ struct _MMIfaceModemVoice {
     gboolean (* hangup_and_accept_finish) (MMIfaceModemVoice    *self,
                                            GAsyncResult         *res,
                                            GError              **error);
+
+    /* Hangup all */
+    void     (* hangup_all)        (MMIfaceModemVoice    *self,
+                                    GAsyncReadyCallback   callback,
+                                    gpointer              user_data);
+    gboolean (* hangup_all_finish) (MMIfaceModemVoice    *self,
+                                    GAsyncResult         *res,
+                                    GError              **error);
 };
 
 GType mm_iface_modem_voice_get_type (void);