3Com MSR 50 Series Configuration Manual page 2324

2324 C 134: E1
HAPTER AND
T1 C
ONFIGURATION
Table 86 Group II forward signals
Designation
II-7
II-8
II-9
II-10
II-11 through II-15
Group B backward signals: Identify the state of the called party, and
■
acknowledge Group II signals and control connection.
Table 87 Group B backward signals
Designation
B-1
B-2
B-3
B-4
B-5
B-6
B-7
B-8
B-9 through B-15
The following figure shows the exchange process requesting calling party
information, which is typical of R2 interregister signaling.
Basic Meaning
Subscriber (or operator without forward transfer facility), for
international use
Data transmission (for international use)
Subscriber with priority (for international use)
Operator with forward transfer facility (for international aid use)
Spare for national use
Basic Meaning
Spare for national use
Send special information tone
Subscriber line busy
Congestion
Unallocated number
Subscriber line free, charge
Subscriber line free, no charge
Subscriber line out of order
Spare for national use