25391 erl is total erlang in one day or a month we should know that vlue exactly what is ?
so…if i have erlang value then i have to get the local calls , international calls and sms rate …if i get all these values then average them the mutiply it by minutes value
for example :
if i have 3000 erlang my average rate is 0.04 $ i consider it as one day
3000 * 60 = 180000 minutes
180000 * 0.04$ = 7200 $