3com MSR 20-20 참조 매뉴얼

By default, the originating party requires the terminating party to send answer 
signal.

This command applies to R2 signaling only.

The R2 line signaling coding schemes in some countries do not include answer 
signal sending. To accommodate to such schemes, you must configure the 
answer enable command on the originating point. This allows the terminating 
point to set up calls after a specified time period.

re-answer enable and timer dl re-answer.

# Configure the originating point to disable the terminating point from sending 
answer signals.

<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] undo answer enable 

callmode { segment | terminal }

R2 CAS view

segment: Specifies the connection mode for an R2 call as segment-to-segment.

terminal: Specifies the connection mode for an R2 call as terminal-to-terminal.

Use the callmode command to configure the connection mode for an R2 call.

Use the undo callmode command to restore the default setting.

By default, the connection mode for an R2 call is terminal.

# Set the connection mode for an R2 call to segment.

<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-cas 1/0:0] callmode segment 

cas ts-set-number