This works like this:
*200*0# - activates main number
*200*1# - activates additional number
*200*1*600# - activates additional number for 10minutes (600sec).
*200*8# - hides your number while originating call
*200*9# - makes you unavailable from other number

So I need multiple shortcuts in the desktop. It would be nice to see a conformation message like Maemo shows warnings (in the yellow line over screen) but this is not important.