Toshiba V.90 - Manual (Page 46)

AT Commands
AT command formats
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command is only used in V.22 and V.22bis mode. This option is
not used from North America and is for international use only.
Result Codes:
&Kn Local flow control selection
Result Codes:
&Pn Select Pulse Dial Make/Break Ratio
&G0 Guard tone disabled (default).
&G1 Sets guard tone to 550 Hz.
&G2 Sets guard tone to 1800 Hz.
OK n=0,1,2
ERROR Otherwise
&K0 Disables flow control.
&K3 Enables RTS/CTS flow control (default).
&K4 Enables XON/XOFF flow control.
OK n=0,3,4
ERROR Otherwise
&P0 Selects 39% - 61% make/break ratio at 10 pulses
per second.
&P1 Selects 33% - 67% make/break ratio at 10 pulses
per second.
&P2 Selects 33% - 67% make/break ratio at 20 pulses
per second.