H3C Technologies H3C MSR 5600 - Manual (Page 48)

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Designation Basic Meaning
A-12 Send language or discrimination digit
A-13 Send nature of circuit
A-14
Request for information on use of an echo canceller (is an incoming half-echo
suppressor required?)
A-15
Congestion in an international exchange; terminate interregister signaling
interaction or at its output
• Group II forward signals—Identify the calling party category. The system looks at the calling party
category to decide whether the calling party can perform forced release or break-in.
Table 6 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
II-7 Subscriber (or operator without forward transfer facility), for international use
II-8 Data transmission (for international use)
II-9 Subscriber with priority (for international use)
II-10 Operator with forward transfer facility (for international aid use)
II-11 through II-15 Spare for national use
• Group B backward signals—Acknowledge Group II signals and indicate the status of the called
party.
Table 7 Group B backward signals
Designation Basic Meaning
B-1 Spare for national use
B-2 Send special information tone
B-3 Subscriber line busy
B-4 Congestion
B-5 Unallocated number
B-6 Subscriber line free, charge
B-7 Subscriber line free, no charge
B-8 Subscriber line out of order
B-9 through B-15 Spare for national use