3com MSR 20-20 참조 매뉴얼

modem [ both | call-in | call-out ]

undo modem [ both | call-in | call-out ]

User interface view

both: Permits both modem call-in and modem call-out.

call-in: Permits only modem call-in.

call-out: Permits only modem call-out.

Use the modem command to enable modem call-in and call-out on the interface.

Use the undo modem command to disable modem call-in or call-out.

By default, both modem call-in and call-out are disabled on the interface.

# Enable receiving incoming Modem calls on User-interface 1.

<Sysname> system-view

[Sysname] user-interface tty 1

[Sysname-ui-tty1] modem call-in 

User interface view

None

Use the modem auto-answer command to have the external modem 
connected to the asynchronous interface automatically answer or hook off.