phablet@ubuntu-phablet:~$ dbus-send --print-reply --dest=com.canonical.indicator.sound "/com/canonical/indicator/sound" "org.gtk.Actions.DescribeAll"
method return sender=:1.64 -> dest=:1.157 reply_serial=2
   array [
      dict entry(
         string "mediaplayer-app.desktop.greeter"
         struct {
            boolean false
            signature ""
            array [
               variant                   array [
                     dict entry(
                        string "running"
                        variant                            boolean true
                     )
                     dict entry(
                        string "state"
                        variant                            string "Stopped"
                     )
                  ]
            ]
         }
      )
      dict entry(
         string "mute"
         struct {
            boolean true
            signature ""
            array [
               variant                   boolean false
            ]
         }
      )
      dict entry(
         string "phone-settings"
         struct {
            boolean true
            signature ""
            array [
            ]
         }
      )
      dict entry(
         string "mic-volume"
         struct {
            boolean true
            signature ""
            array [
               variant                   double 1
            ]
         }
      )
      dict entry(
         string "scroll"
         struct {
            boolean true
            signature "i"
            array [
            ]
         }
      )
      dict entry(
         string "high-volume"
         struct {
            boolean true
            signature ""
            array [
               variant                   boolean false
            ]
         }
      )
      dict entry(
         string "play-playlist.mediaplayer-app.desktop"
         struct {
            boolean true
            signature "s"
            array [
            ]
         }
      )
      dict entry(
         string "desktop-settings"
         struct {
            boolean true
            signature ""
            array [
            ]
         }
      )
      dict entry(
         string "volume-sync"
         struct {
            boolean true
            signature "t"
            array [
               variant                   uint64 0
            ]
         }
      )
      dict entry(
         string "mediaplayer-app.desktop"
         struct {
            boolean false
            signature ""
            array [
               variant                   array [
                     dict entry(
                        string "running"
                        variant                            boolean true
                     )
                     dict entry(
                        string "state"
                        variant                            string "Stopped"
                     )
                  ]
            ]
         }
      )
      dict entry(
         string "play.mediaplayer-app.desktop"
         struct {
            boolean true
            signature ""
            array [
               variant                   string "Stopped"
            ]
         }
      )
      dict entry(
         string "volume"
         struct {
            boolean true
            signature "i"
            array [
               variant                   double 0.703674
            ]
         }
      )
      dict entry(
         string "next.mediaplayer-app.desktop"
         struct {
            boolean true
            signature ""
            array [
            ]
         }
      )
      dict entry(
         string "indicator-shown"
         struct {
            boolean true
            signature ""
            array [
               variant                   boolean false
            ]
         }
      )
      dict entry(
         string "root"
         struct {
            boolean true
            signature ""
            array [
               variant                   array [
                     dict entry(
                        string "title"
                        variant                            string "Sound"
                     )
                     dict entry(
                        string "accessible-desc"
                        variant                            string "Volume (70%)"
                     )
                     dict entry(
                        string "icon"
                        variant                            struct {
                              string "themed"
                              variant                                  array [
                                    string ""
                                 ]
                           }
                     )
                     dict entry(
                        string "visible"
                        variant                            boolean true
                     )
                  ]
            ]
         }
      )
      dict entry(
         string "silent-mode"
         struct {
            boolean true
            signature ""
            array [
               variant                   boolean false
            ]
         }
      )
      dict entry(
         string "previous.mediaplayer-app.desktop"
         struct {
            boolean true
            signature ""
            array [
            ]
         }
      )
   ]
phablet@ubuntu-phablet:~$