Silicon Laboratories SI2494/39 manual Telephone Answering Machine, NAME=JONES Jennifer

AN93

7.6. Telephone Answering Machine

7.6.1. Overview

The Si2494/39 supports telephone answering machine (TAM) operations. These parts use the V.253 command set to control operation. This section covers the three major TAM-related system voice modes. Some modes offer multiple operations.

The TAM Hands-Free mode is the general voice idle mode. It is used for OGM recording/review and local ICM recording/review via hands-free operation. The TAM Handset mode is similar to TAM Hands-Free except that the audio is handled over the handset. The TAM PSTN mode is for playback of the OGM and recording the ICM. The TAM PSTN mode also permits remote OGM and ICM record/review via DTMF tone control. The +VTX command is used to play voice menu options/prompts. All the use cases in this section start with the modem in TAM

Hands-Free mode, which is configured in the initialization sequence in Table 119 on page 194. 7.6.2. TAM Hands-Free—Idle

The modem will use the events listed in Table 112 on page 179 to communicate status. The <DLE><R> event indicates ring detection. The +VTS command can be used to play one or more single/dual tone sequences. If enabled, Type I CID is decoded after the first ring and sent via a complex <DLE> event report. See Table 126 for details.

Table 126. Local Ring Notification with Type I CID Event

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	Receive Type I CID DLE complex report.
	TIME=0110
	NMBR=102
	NAME=JONES JENNIFER
	<DLE><.>
	<DLE><R>	Ring Detection.
AT+VTS=[700,500,80]	OK	Play local ring tone.
		Ring Detection. The voice driver will use a
	<DLE><R>	rings-to-answer count. This example uses
		three rings before answer.
AT+VTS=[700,500,80]	OK	Play local ring tone.

Based upon the TAM answer function settings, a ring counter will validate the number of rings before answer. If the TAM Answer function is disabled or the number of rings before answer has not been reached, the user has the opportunity to answer the call via handset or speakerphone.

Rev. 1.3 201