Hi telecominfo as u said it is used to prevent cracking of the existing mechanism.but does it affect sddrp.
actually we just On the A5/1 cipher in our network and it drastically increases our sddrp.
however we just came to conclusion the wherever we enable this parameter ISIC=2.there is slight improvement in sddrp.
but we r still not able to figure out how this happen.NEED UR HELP