steped up on this thread...



Ok. Firts of all I have Nokia BH-111 BT headset.
all buttons work fine and control the device (media player - play/pause /next / prev) and phone (accept call & redial)

Doing some tests with dbus-monitor up:
Nokia-N900:~# dbus-monitor --system
signal sender=org.freedesktop.DBus -> dest=:1.529 serial=2 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=NameAcquired
string ":1.529"
signal sender=:1.12 -> dest=(null destination) serial=3995 path=/org/freedesktop/Hal/devices/computer_logicaldev_input_1; interface=org.freedesktop.Hal.Device; member=Condition
string "ButtonPressed"
string "play-cd"
signal sender=:1.48 -> dest=(null destination) serial=751 path=/com/nokia/tklock/signal; interface=com.nokia.tklock.signal; member=mm_key_press
uint32 208
uint32 269025044
signal sender=:1.12 -> dest=(null destination) serial=4032 path=/org/freedesktop/Hal/devices/computer_logicaldev_input_1; interface=org.freedesktop.Hal.Device; member=Condition
string "ButtonPressed"
string "next-song"
signal sender=:1.48 -> dest=(null destination) serial=760 path=/com/nokia/tklock/signal; interface=com.nokia.tklock.signal; member=mm_key_press
uint32 171
uint32 269025047
signal sender=:1.12 -> dest=(null destination) serial=4033 path=/org/freedesktop/Hal/devices/computer_logicaldev_input_1; interface=org.freedesktop.Hal.Device; member=Condition
string "ButtonPressed"
string "previous-song"
signal sender=:1.48 -> dest=(null destination) serial=761 path=/com/nokia/tklock/signal; interface=com.nokia.tklock.signal; member=mm_key_press
uint32 173
uint32 269025046

signal sender=:1.18 -> dest=(null destination) serial=6451 path=/com/nokia/csd/call; interface=com.nokia.csd.Call; member=CreateRequested
string "xxxTELNUMBER010"
uint32 0
signal sender=:1.18 -> dest=(null destination) serial=6452 path=/com/nokia/csd/call; interface=com.nokia.csd.Call; member=ServerStatus
boolean true
boolean false
signal sender=:1.18 -> dest=(null destination) serial=6453 path=/com/nokia/csd/call; interface=com.nokia.csd.Call; member=Created
object path "/com/nokia/csd/call/1"
string "xxxTELNUMBER010"


As you can see, dbus catches button press for headset play button, next and prev buttons.
Unfortunantly, it seems that it's not catching the "redial" or "answer/reject" button or they just dont generate dbus events...