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+FRH=<mod> Receive HDLC data
+FRHM=<mod> Receive data
+FRS=<time> Wait for silence
+FRTn Fax receive test command
+FTH=<mod> Transmit HDLC data
+FTM=<mod> Transmit data
+FTS=<time> Stop transmission and pause
+FTTn Fax transmit test command
3.7 Voice Mode Commands
#VBP Generate beep tone
#VCL=n Voice mode selection. Default is 0
#VCSD=n Command mode silence detection. Default is 0
#VGPS=n Input pin function selection. Default is 0
#VGPC=n Input pin character selection. Default is 0
#VIN Read general purpose input pins
#VIP=n Initialize parameter. Default is 0
#VLN=n Relay/speaker control. Default is 0
#VOUT=n Write to output pins. Default is 0
#VPH Telephone emulation mode.
#VPL=n Play level. Default is 127
#VPY Play mode
#VRD Record mode
#VRL=n Recording level. Default is 127
#VSL=n Recording silence threshold level. Default
is 127
#VSM=n Sampling mode. Default is CL1
#VSQT=n Record mode “q” silence time. Default is 60
#VSR=n Sampling rate. Default is 9600
#VSST=n Record mode “s” silence time. Default is 60
Setion Four - S Registers
Your modem has 35 registers, designated S0 through
S30, S37, S90, S108, and S109. Table 4-1 shows the regis-
ters, their functions, and their default values. Some registers
can have their values changed by commands. If you use a
command to change a register value, the command remains
in effect until you turn off or reset your modem. Your modem
then reverts to the operating characteristics specified in its
non-volatile memory. Refer to Section 3 for information on
how to use the AT commands to manipulate the S registers.