the sms uses a different channel than TCH, so it is not counted in the tch erlang.
and yes, i did a mistake in my calculation !! 25391 erl in one day = * 60 = 1,523,460 minutes
1,523,460 minutes * 0.02 = 30,500$ / day
sorry about the previous error… and thanks johan for pointing it out 🙂