Reply To: CSR Formula 1st December 2010 at 21:38 #65199 RexGuest Hi, CALL_SUCC_RATE=CALL_SETUP_SUCC_RATE * (1-CALL_DROP_RATE); CALL_SETUP_SUCC_RATE=(1-SDCCH_DROP_RATE)*(1-TCH_ASSIGNMENT_FAILURE_RATE) Regards, Rex