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H3C Technologies H3C MSR 5600 User 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