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4.4 MFC-R2 SIGNALING 99TABLE 4.4-3 Example of R2 National Backward InterregisterSignalsGroup AA-1 Send next digit of called numberA-2 Resend first digit of called numberA-3 Send calling line category and prepare to receive a group B signalA-4 CongestionA-5 Send calling line categoryA-6 Not usedA-7 Send next digit of calling numberA-8 Digit n of called number received; resend digit (n 2 1)A-9 Digit n of called number received; resend digit (n 2 2)A-10 through A-15 are not usedGroup BB-1 Called subscriber idle, chargeB-2 Called subscriber busyB-5 Called subscriber idle, do not chargeB-6 Called party idle, call to be held under control of called subscriberB-7 Vacant number receivedB-3, B-4, and B-8 through B-15 are not usedFigure 4.4-4. R2 interregister signaling example.