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&F – Restore factory configuration
The command restores the original factory setting of all parameters. These will only be used, until
a restart of the modem occurs. When the modem restarts it will use the settings previously stored in
profile 0 or profile 1, depending on the 8Yn command. If one wishes to keep the default values to
next restart, use the command &W directly after the &F.
\F – Display stored phone numbers
The numbers that have been stored with the command &Z are displayed when entering \F.
Please also refer to AT&Z, ATD
&Gn – Guard Tone
This command makes the answering modem generate a permanent tone on the line to keep it open.
The public phone networks in many countries save bandwidth in the lines by listening if someone is
talking during a call, if not the subscriber is temporarily disconnected and then re-connected when he
starts talking. This works well during voice transfer, but generates problems during data communica-
tion when DPSK modulation (V.22 and faster) is interpreted as noice by the phone stations.
The tone shuts off any echo suppression equipment, which also can effect the communication.
&G0
Disables guard tone. (Default)
&G1
Equivalent to &G0.
&G2
Selects 1800 Hz guard tone.
\Gn – Modem-to-Modem Flow Control
In non-error correction mode this command enables XON/XOFF flow control between the modems. In
error correction mode this command has no function.
The value is written to S41 bit 3.
\G0
Disables flow control. (Default)
\G1
Enables XON/XOFF flow control.
Please also refer to AT&K, S41
