H3C Technologies H3C MSR 5600 User Manual
Page 48
38
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