IBM pSeries 690 Service Manual page 1104

expect "0\r" or "OK\r\n" timeout 2 # Confirm commands successful.
send "ATV0S0=0\r"
expect "0\r" timeout 2
done
error:
expect "8\r" or "7\r" or "6\r" or "4\r" or "3\r"
delay 2
done
1088 Eserver pSeries 690 Service Guide
# Numeric response code
# Auto Answer OFF
# Confirm commands successful.
#
# Handle unexpected modem
# responses.