Silicon Laboratories SI2494/39, SI2493/57/34/15/04 manual AT+VLS=15, Icm

AN93

Table 131. TAM PSTN Normal Answer – OGM Playback with ICM Record (Continued)

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><ETX>	OK	Terminate the transmit operation. The
		modem will respond with OK to denote the
		return to command mode.
AT+VSM=131	OK	Select G.726 ADPCM, 4-bit, 32 kbps for-
		mat.
AT+VTS=[1000,0,100]	OK	Play user record tone prompt.
AT:U0B5,0200	OK	Restore DAA-to-Si3000 receive gain path.
		This will allow call screening of the ICM.
AT:U199&FFF7	OK	Enable speaker for call screening of the
		ICM.
		Trigger receive operation. The first byte
AT+VRX	CONNECT	after the newline character following the
		CONNECT message will be the first data
		stream byte.
		Receive ICM voice stream. During voice
		stream capture, the user can adjust the
	[Voice Stream]	UBF value via the <DLE><u> and
		<DLE><d> commands. The host voice
		driver will need track the number of adjust-
		ments and update the +VGR value for
		future use.
		Terminate the receive operation. The
		modem will respond with <DLE><ETX> to
<DLE><!>	<DLE><ETX>	mark the end of the data stream. The OK
		denotes the return to command mode. A
	OK
		loss of loop current, parallel phone detect,
		timeout, or silence event can trigger the
		<DLE><!> transmission.

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