Silicon Laboratories SI2493/57/34/15/04 manual TAM Pstn Normal Answer OGM Playback with ICM Record

AN93

7.6.3.3. Record Local ICM

The Record Local ICM is identical to the Record OGM procedure provided in Table 129 on page 204. The main difference is that one of the ADPCM formats is generally used and the PCM file is stored with the other ICM files recorded from the PSTN.

7.6.3.4. Review ICM

The Review ICM is identical to the Review OGM procedure provided in Table 130 on page 206. The main difference is that one of the ADPCM formats is generally used to conserve message space.

7.6.4. TAM PSTN

This system voice mode differs from the TAM Hands-Free and TAM Handset modes in that the modem is off-hook and connected to the PSTN. Due to the paired nature of the +VGR and +VGT, the voice driver should maintain two copies of each: one for RS232-to-Si3000 and another for RS232-to-DAA. See Figure 29 on page 188 for details.

7.6.4.1. Normal Answer – OGM Playback with ICM Record

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

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.
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.

208 Rev. 1.3