When dialing the GCC at 312.456.2391, dependent on the nature of the call, the GCC requires that you have the following information available. To ensure the quickest and most efficient response, the GCC has prepared the following Trading Assistance Cards:

• CME® Globex® Control Center Phone Menu (PDF)
  Describes GCC phone routing menu
• CME Globex Control Center (PDF)
  Details order status and/or cancellation of orders
• CME Enhanced Eurodollar Options (PDF)
  Details order status and/or cancellation of Eurodollar Options and Option Strategy orders
• CME MassQuote (PDF)
  Details order status and/or cancellation of CME MassQuotes