cat /etc/asound.conf 
pcm.headset-sco-resample {
        #Resample-Device for Skype >1.4
        type plug
        slave {
                pcm "headset"
                rate 8000
                format S16_LE
                channels 1
        }
}

pcm.headset {
        @args [BDADDR TIMEOUT]

        # The Bluetooth device address for target headset, used for Audio Gateway (PC) initiated connections
        # Please note that this value is ignored when the connection is Headset initiated
        @args.BDADDR {
                type string
                # Enter address of your headset here
                default "00:1A:0E:08:03:90"
        }

        # This value represents how long we will try to reach the headset, until we give up.
        # Value is in milliseconds
        @args.TIMEOUT {
                type integer
                default 6000
        }

        type        sco
        bdaddr      $BDADDR
        timeout     $TIMEOUT
}

ctl.headset {
        type sco
}