The operation of a modem at the serial interface requires the following settings:
- Request modem ID [Default: ATI6]
- Reset command [default: AT&F]
- Initialize command [default: ATL0M1X1S0=0]
- L0: Loudspeaker quiet
- M1: Loudspeaker on while connecting
- X1: Operation at an extension
- S0=0: Disable auto answering
- Deactivate modem echo [default: ATE0]
- AT polling cycle time [Default: 1 in seconds]
- AT polling count [Default: 5]
- Ring count [Default: 1]
- Initialize answer command
- Answer command [Default: ATA]
- Initialize dial command
- Dial command [default: ATDT]
- Escape sequence to terminate data phase resp. to return to command phase [Default: +++]
- Hold time after escape sequence [Default: 1000 in milliseconds]
- Disconnect: command to hang up during data phase [Default: ATH]
Note: The modem parameters are set with values that should suit most modems.
Thus changes are generally not necessary. Refer to the documentation
for your modem for settings that vary from these.