This object specifies the backward signal requesting the far exchange switch back to Group A signaling and send the next DNIS digit in sequence. This combines a group-transition instruction with a specific digit-advance request in one signal, which R2 variants use to keep digit collection moving efficiently without a separate group-switch step, unlike the plain next-digit signals used within an already-established group. If the exchange had temporarily moved to a different signal group mid-call, this signal would both pull it back to Group A and request the next DNIS digit in the same step, resuming normal digit collection.