Toshiba Portege 3500 User Manual page 196

AT Commands
H-6
This command turns the speaker on or off.
M0
The speaker is off.
M1
The speaker is on until the modem detects the
carrier signal (default).
M2
The speaker is always on when modem is off-hook.
M3
Speaker is on until the carrier is detected, except
when dialing.
Result Codes:
n = 0, 1, 2, 3
OK
Otherwise
ERROR
This command controls whether or not the local modem
performs a negotiated handshake at connection time with the
remote modem when the communication speed of the two
modems is different.
N0
When originating or answering, this is for
handshake only at the communication standard
specified by S37 and the ATB command.
N1
When originating or answering, begin the
handshake at the communication standard
specified by S37 and the ATB command (default).
During handshake, a lower transmission speed may
be selected.
Result Codes:
n = 0, 1
OK
Otherwise
ERROR
Portégé 3500