3Com MSR 50 Series Configuration Manual page 2323

Table 84 Forward Group I signals
Designation Basic meaning
I-1 through I-10 Digits 1, 2, 3, 4, 5, 6, 7, 8, 9, and 0, responsible for sending number
information to the terminating point
I-11 Spare for national use
I-12 Request refused
I-13 Connected to tested device
I-14 Spare for national use
I-15 Address identification terminator and pulse terminator (used in
international calls)
Group A backward signals: Control signals used for controlling and
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acknowledging Group I forward signals.
Table 85 Group A backward signals
Designation Basic Meaning
A-1 Send next digit
A-2 Send last but one digit
A-3 Address-complete; changeover to reception of Group B signals
A-4 Congestion in the national network; terminate interregister signaling
exchange
A-5 Send calling party's category
A-6 Address-complete; terminate interregister signaling exchange, charge,
and set up speech conditions
A-7 Send last but two digits
A-8 Send last but three digits
A-9 Spare for national use
A-10 Spare for national use
A-11 Send country code indicator
A-12 Send language or discrimination digit
A-13 Send nature of circuit
A-14 Request for information on use of an echo canceller
A-15 Congestion in an international exchange; terminate interregister
signaling interaction
Group II forward signals: Identify the calling party category. The system looks at
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the calling party category to decide whether the calling party can perform
forced release or break-in.
Table 86 Group II forward signals
Designation Basic Meaning
II-1 Subscriber without priority
II-2 Subscriber with priority
II-3 Maintenance equipment
II-4 Spare for national use
II-5 Operator
II-6 Data transmission
Configuring R2 Signaling 2323