Black Box LRA001A-R2 User Manual page 259

ASYNC ROUTER AR-P, AR-5, AND SYNC ROUTER REFERENCE MANUAL
The Router's modem speaker is on by default during call setup. You can control the modem speaker's
volume using the dialup iface volume {on | low | medium | high} command. After invoking the dialup volume
command, use the config save command to save the modem speaker's volume setting. Don't use an
init_string to control the modem speaker's volume.
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