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76 536EX Chipset Developer’s Manual
Intel Confidential
IS-101 Voice Mode AT Commands
+VGT=m 128
Volume Selection: This command sets the volume level for the modem’s playback voice mode. A
different playback level may be needed for each type of playback device (telephone line, local handset,
local telephone, or speaker).
Range: 121–131
128* Nominal transmit level
+VIP none
Initialize Parameter: This command causes the modem to initialize all voice parameters to the factory
default values. This command does not change relay or speaker setup (that is, if the modem is off-
hook, then the modem remains off hook after processing this command).
+VIT=m 0
DTE/DCE Inactivity Timer: This command sets the length of time the modem can be inactive in voice
mode before the modem resets its relays +VLS=0 and changes to data mode (FCLASS=0) with
autobauding. The purpose of this timer is to ensure that the DTE does not leave the DCE in a mode
that cannot be accessed by voice-unaware software. This timer is supported in playback, record and
voice command mode. Sending any data (such as a <DLE><NUL> string) to the modem re-initializes
this timer.
Range: 0–255 (units of 1.0 second)
m = 0* Disables inactivity timer
m ≠ 0 Inactivity timer active
Table 25. Voice Mode Command Descriptions (Continued)
Command Default Description
NOTE: An asterisk (*) denotes the factory-default setting.