If the IR service is already activated then you can use IR services provided you have sufficient monetary balance in your account. In such case, you have to recharge with Top Up voucher to get monetary balance.
IR Pack Rs. 1101/Rs. 1102 offers monetary balance and any usage made in IR is charged at standard PayGo rates. Also, IR Pack Rs. 1101/Rs. 1102 pack offers 5 International SMS free which can be used to send ISD SMS while in India.