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 &G - guard tones

 &G      Same as &G0.
 &G0     No guard tones.
 &G1     550 Hz guard tone.
 &G2     1800 Hz guard tone.

 Someone told me that guard tones were needed to turn off echo-
 suppression circuitry on transatlantic phone lines.  I don't know if
 that's true, or even what it means.  Whatever they are, guard tones are
 not used in North America.

 Default setting: &G0        Recommended setting: &G0

 Example:

     SendModem(nPort, "AT&G0" + chr(13))