Silicon Laboratories SI2494/39, SI2493/57/34/15/04 manual DLE1 Dtmf 1 digit detected

AN93

Table 132. TAM PSTN Interrupted Answer – OGM Playback with DTMF Menu Entry (Continued)

Host to Modem Commands / Data	Modem to Host Result	Local Modem Actions
	Codes/Data
AT+VGT=128	OK	Set the RS232-to-DAA transmit gain regis-
		ter (UB3) for TAM PSTN.
AT+VSD=129	OK	Set sensitivity level for ICM recording
		silence detection.
AT+VSM=4	OK	Select G.711U μ-law PCM, 8-bit, 64 kbps
		format. The voice driver will need to track
		the OGM format with the OGM PCM file.
AT+VLS=0	OK	Disable voice mode. Used as a transition
		point between non-zero +VLS voice
		modes.
AT+VLS=15	OK	Setup off-hook voice to PSTN. See
		Table 117 on page 190 for details.
AT+VTX	CONNECT	Trigger transmit operation.
	<DLE><u>	TX Underrun. Appears at the start of +VTX
		before transmit data are seen.
		Transmit OGM voice stream. During voice
		stream capture, the user can adjust the
[Voice Stream]		UB3 value via the <DLE><u> and
		<DLE><d> commands. The host voice
		driver will need track the number of adjust-
		ments and update the +VGT value for
		future use.
	<DLE><~>
	<DLE><1>	DTMF 1 digit detected.
	<DLE></>
	<DLE><~>
	<DLE><2>	DTMF 2 digit detected.
	<DLE></>
	<DLE><~>
	<DLE><3>	DTMF 3 digit detected.
	<DLE></>
	<DLE><~>	DTMF 4 digit detected. The password of
	<DLE><4>	1234 has been matched. Abort answer
	<DLE></>	sequence.
<DLE><ETX>	OK	Terminate the transmit operation. The
		modem will respond with OK to denote the
		return to command mode.

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