diff --git a/examples/device/src/tusb_descriptors.c b/examples/device/src/tusb_descriptors.c
index 4a58161f..82d9d1fb 100644
--- a/examples/device/src/tusb_descriptors.c
+++ b/examples/device/src/tusb_descriptors.c
@@ -181,7 +181,7 @@ app_descriptor_configuration_t const desc_configuration =
         .bConfigurationValue = 1,
         .iConfiguration      = 0x00,
         .bmAttributes        = TUSB_DESC_CONFIG_ATT_BUS_POWER,
-        .bMaxPower           = TUSB_DESC_CONFIG_POWER_MA(100)
+        .bMaxPower           = TUSB_DESC_CONFIG_POWER_MA(500)
     },
 
     #if TUSB_CFG_DEVICE_CDC
@@ -222,14 +222,22 @@ app_descriptor_configuration_t const desc_configuration =
         .bcdCDC             = 0x0120
     },
 
+    .cdc_call =
+    {
+        .bLength            = sizeof(cdc_desc_func_call_management_t),
+        .bDescriptorType    = TUSB_DESC_TYPE_INTERFACE_CLASS_SPECIFIC,
+        .bDescriptorSubType = CDC_FUNC_DESC_CALL_MANAGEMENT,
+        .bmCapabilities     = { 0 },
+        .bDataInterface     = INTERFACE_NO_CDC+1,
+    },
+
     .cdc_acm =
     {
         .bLength            = sizeof(cdc_desc_func_abstract_control_management_t),
         .bDescriptorType    = TUSB_DESC_TYPE_INTERFACE_CLASS_SPECIFIC,
         .bDescriptorSubType = CDC_FUNC_DESC_ABSTRACT_CONTROL_MANAGEMENT,
-        .bmCapabilities     = { // 0x06
+        .bmCapabilities     = { // 0x02
             .support_line_request = 1,
-            .support_send_break   = 1
         }
     },
 
@@ -238,8 +246,8 @@ app_descriptor_configuration_t const desc_configuration =
         .bLength                  = sizeof(cdc_desc_func_union_t), // plus number of
         .bDescriptorType          = TUSB_DESC_TYPE_INTERFACE_CLASS_SPECIFIC,
         .bDescriptorSubType       = CDC_FUNC_DESC_UNION,
-        .bControlInterface        = 0,
-        .bSubordinateInterface    = 1,
+        .bControlInterface        = INTERFACE_NO_CDC,
+        .bSubordinateInterface    = INTERFACE_NO_CDC+1,
     },
 
     .cdc_endpoint_notification =
@@ -249,7 +257,7 @@ app_descriptor_configuration_t const desc_configuration =
         .bEndpointAddress = CDC_EDPT_NOTIFICATION_ADDR,
         .bmAttributes     = { .xfer = TUSB_XFER_INTERRUPT },
         .wMaxPacketSize   = { .size = 0x08 },
-        .bInterval        = 0x0a
+        .bInterval        = 0x10
     },
 
     //------------- CDC Data Interface -------------//
diff --git a/examples/device/src/tusb_descriptors.h b/examples/device/src/tusb_descriptors.h
index e6a9c01a..322af039 100644
--- a/examples/device/src/tusb_descriptors.h
+++ b/examples/device/src/tusb_descriptors.h
@@ -130,7 +130,7 @@
 //--------------------------------------------------------------------+
 // CONFIGURATION DESCRIPTOR
 //--------------------------------------------------------------------+
-typedef ATTR_PACKED_STRUCT(struct)
+typedef struct ATTR_PACKED
 {
   tusb_descriptor_configuration_t              configuration;
 
@@ -141,6 +141,7 @@ typedef ATTR_PACKED_STRUCT(struct)
   //CDC Control Interface
   tusb_descriptor_interface_t                  cdc_comm_interface;
   cdc_desc_func_header_t                       cdc_header;
+  cdc_desc_func_call_management_t              cdc_call;
   cdc_desc_func_abstract_control_management_t  cdc_acm;
   cdc_desc_func_union_t                        cdc_union;
   tusb_descriptor_endpoint_t                   cdc_endpoint_notification;
diff --git a/tinyusb/class/cdc/cdc_device.c b/tinyusb/class/cdc/cdc_device.c
index 9867b9e6..f15255e4 100644
--- a/tinyusb/class/cdc/cdc_device.c
+++ b/tinyusb/class/cdc/cdc_device.c
@@ -103,7 +103,13 @@ void cdcd_init(void)
 
   // default line coding is : stop bit = 1, parity = none, data bits = 8
   memclr_(cdcd_line_coding, sizeof(cdc_line_coding_t)*CONTROLLER_DEVICE_NUMBER);
-  for(uint8_t i=0; i<CONTROLLER_DEVICE_NUMBER; i++) cdcd_line_coding[i].data_bits = 8;
+  for(uint8_t i=0; i<CONTROLLER_DEVICE_NUMBER; i++)
+  {
+    cdcd_line_coding[i].bit_rate  = 115200;
+    cdcd_line_coding[i].stop_bits = 0;
+    cdcd_line_coding[i].parity    = 0;
+    cdcd_line_coding[i].data_bits = 8;
+  }
 }
 
 tusb_error_t cdcd_open(uint8_t coreid, tusb_descriptor_interface_t const * p_interface_desc, uint16_t *p_length)
@@ -195,6 +201,24 @@ tusb_error_t cdcd_control_request_subtask(uint8_t coreid, tusb_control_request_t
     break;
 
     case CDC_REQUEST_SET_CONTROL_LINE_STATE: // TODO extract DTE present
+    {
+      enum {
+        ACTIVE_DTE_PRESENT     = 0x0003,
+        ACTIVE_DTE_NOT_PRESENT = 0x0002
+      };
+
+      if (p_request->wValue == ACTIVE_DTE_PRESENT)
+      {
+        // terminal connected
+      }
+      else if (p_request->wValue == ACTIVE_DTE_NOT_PRESENT)
+      {
+        // terminal disconnected
+      }else
+      {
+        // De-active --> disconnected
+      }
+    }
     break;
 
     default: return TUSB_ERROR_DCD_CONTROL_REQUEST_NOT_SUPPORT;
diff --git a/tinyusb/device/usbd.c b/tinyusb/device/usbd.c
index 4b3620ab..936fd78f 100644
--- a/tinyusb/device/usbd.c
+++ b/tinyusb/device/usbd.c
@@ -244,7 +244,7 @@ tusb_error_t usbd_control_request_subtask(uint8_t coreid, tusb_control_request_t
   tusb_error_t error;
   error = TUSB_ERROR_NONE;
 
-  //------------- Standard Control such as those in enumeration -------------//
+  //------------- Standard Control e.g in enumeration -------------//
   if( TUSB_REQUEST_RECIPIENT_DEVICE == p_request->bmRequestType_bit.recipient &&
       TUSB_REQUEST_TYPE_STANDARD    == p_request->bmRequestType_bit.type )
   {