3com MSR 20-20 참조 매뉴얼

Use the group-b enable command to enable R2 signaling to use Group B signals 
to complete registers exchange.

Use the undo group-b enable command to disable R2 signaling from using 
Group B signals to complete registers exchange.

By default, Group B signals are used to complete registers exchange.

This command applies to R2 signaling only.

You may need to configure the undo form of this command to accommodate to 
the R2 interregister signaling in some countries where Group B signals is not 
supported or cannot be interpreted correctly.

register-value req-switch-groupb.

# Adopt Group B signals to complete registers exchange.

<Sysname> system-view

[Sysname] controller e1 1/0

[Sysname-e1 1/0] timeslot-set 0 timeslot-list 1-31 signal r2

[Sysname-e1 1/0] cas 0

[Sysname-cas1/0:0] group-b enable 

line slot-number:{ ts-set-number | 15 | 23 }

POTS voice entity view

slot-number: Number of the E1/T1 interface corresponding to a subscriber line.

ts-set-number: Number of the TS group created on the E1/T1 interface.

15: Indicates that the POTS voice entity is to be associated with an E1 voice ISDN 
PRI interface.

23: Indicates that the POTS voice entity is to be associated with a T1 voice ISDN PRI 
interface.

Use the line command to configure the binding between a POTS entity and a 
logical voice subscriber line.

Use the undo line command to remove the binding.

By default, there is no binding between a POTS entity and a logical voice 
subscriber line.

This command applies to both E1 and T1 voice.