User guide

26 RealCT Direct API Developer Guide

Chapter 2: Digit Handling

Group II Signals

The outgoing register switches to Group II signals after the

incoming register sends signal A-3 or A-5. These signals tell the

receiving end the call category: subscriber, operator, or data.

Table 8 shows the meanings of the Group II signals.

Table 8. Group II Signals

Signal Meaning Comments

1 Subscriber without priority Used nationally

2 Subscriber with priority

3 Maintenance equipment

4Spare

5Operator

6 Data transmission

7 Subscriber, or operator

without forward transfer

facility

Used internationally

8 Data transmission

9 Subscriber with priority

10 Operator with forward

transfer facility

11 Spare for national use