Silicon Laboratories SI2493/57/34/15/04, SI2494/39 manual AT+VLS=14

AN93

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

AT:U0B5,0	OK	Disable DAA-to-Si3000 receive gain path.
		This ensures line events such as CID and
		ring tone are not heard via the codec.
AT:U1992	OK	Mute the microphone.
AT:U199&FFF7	OK	Enable speaker for local ring tone/alert
		tones.
AT+VLS=0	OK	Disable voice mode. Used as a transition
		point between non-zero +VLS voice
		modes. This will hang-up the call.
AT+VLS=14	OK	Setup on-hook TAM voice mode. See
		Table 117 on page 190 for details.

7.6.4.2. Interrupted Answer – OGM Playback with DTMF Menu Entry

The procedure listed in Table 132 uses a remote-access password of 1234. DTMF decoding is asynchronous. The host voice driver will need to employ a timer or timestamp to validate the consecutive DTMF digits that comprise the remote password.

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

Host to Modem Commands / Data	Modem to Host Result	Local Modem Actions
	Codes/Data
	<DLE><R>	Ring Detection
AT+VTS=[700,500,80]	OK	Play local ring tone.
	<DLE><X>
	CIDM
	DATE=0101
	TIME=0110	Receive Type I CID DLE complex report.
	NMBR=102
	NAME=JONES JENNIFER
	<DLE><.>
	<DLE><R>	Ring Detection.
AT+VTS=[700,500,80]	OK	Play local ring tone.
	<DLE><R>	Ring Detection. The voice driver will use a
		rings-to-answer count. This example uses
		three rings before answer.
AT+VTS=[700,500,80]	OK	Play local ring tone.
AT:U1998	OK	Mute the speaker so the OGM is not heard
		locally. The user may remove this com-
		mand to allow local review.
AT+VGR=128	OK	Set the DAA-to-RS232 receive gain regis-
		ter (UBF) for TAM PSTN.

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