This article describes how to set up a bluetooth headset with Archlinux.
You need the btsco package from the community repository. If you use the beyond kernel, then grab the btsco-beyond package.
# pacman -Sy btsco
Finding out your headset's bluetooth bdaddr
You need your headset's bdaddr. It is of the form 12:34:56:78:9A:BC. Either find it in the documentation of your headset, on the headset itself or with the hcitool scan command.
Loading the kernel module
# modprobe snd-bt-sco
loads the btsco kernel module. There will now be an extra audio device. Use alsamixer -cN (where N is most likely 1) to set the volume. You can access the device with any alsa-capable application by choosing the device BT headset, or with any OSS application by using /dev/dspN as the audio device.
But to actually get any sound, you have to connect your headset to the computer first.
Connecting the headset
If you connect your headset for the first time, read the section about pairing first. To connect to your headset to the computer, use the command
$ btsco -f <bdaddr>
$ btsco -f 12:34:56:78:9A:BC
Pairing the headset with your computer
The first time you connect the headset, you have to pair it with the computer. To do this, you need your headset's PIN. Depending on your headset you may have to reset the headset and repeat the pairing everytime you used the headset with another bluetooth device.
There are two ways to pair your headset with the computer:
Install the bluez-gnome package from the community repository. Then start the bt-applet program. Once you try to connect to the headset, a window will open and ask for the PIN.
Before connecting to the headset, enter the command
$ passkey-agent --default <pin>
where <pin> is your headset's PIN. Then try to connect to the headset.