It is quite easy to configure BLF in MSS. Please click menu 'data / local user', and click 'Advance services' tab in local user's configuration dialog:
|Subscribe all users' presence or dialog information||BLF service right.
Only enable this item, current local user can get other local users' status.
|Presence information group||BLF group. It can be blank.
If BLF user is configured with this item, that means it only cares presence information sent by local users in the same group.