Reply To: call drop due to expiry of T200 timer 8th August 2011 at 06:42 #54427 SAYAN SARKARGuest HOW CAN I CHANGE T200F AND T200S VALUE FROM BSC END.THE BSC IS A NOKIA DX-200 BSC.CAN YOU PLEASE SUPPLY THE COMMAND..OR THE PROCESS… WHY THIS TIMER IS NEEDED IN GSM ??