SI2439 datasheet(39/70 Pages) SILABS

39 / 70 page

Si2494/39

Rev. 1.0

+VRX

Receive Voice Stream.

Enable DTE receive of voice stream. The DCE will return a CONNECT response followed by

the voice stream as defined by the +VSM command. The DTE can issue a <DLE><!> or

<DLE><ESC> sequence to terminate the receive stream. The DCE will return a

<DLE><ETX> followed by an OK response for <DLE><!> and <DLE><ESC> followed by an

OK response for <DLE><ESC>. The DCE can be configured to terminate the stream using

the DTE/DCE Inactivity Timer, which is configured using the +VIT command. The DTE will

need to process any <DLE> shielded events present in the data stream. Any <DLE><DLE>

sequences can be preserved to allow less overhead during playback of the stream with the

+VTX command.

+VSD = <sds>,

<sdi>

Silence Detection.

<sds>

Noise level sensitivity

127

Less aggressive [more sensitive, lower noise levels considered to be

silence].

128

Nominal level of sensitivity.

129

More aggressive [less sensitive, higher noise levels considered to be

silence].

<sdi> sets the length of a time interval in 0.1 second units, which must contain no or little

activity, before the ISOmodem will report (QUIET) (<DLE><q>). Default is five seconds.

+VSM = n

Voice Compression Method.

0 Signed PCM

1 Unsigned PCM

4 G.711 µ-Law

5 G.711 A-Law

129 ADPCM 2-bit (2 kB/s storage)

131 ADPCM 4-bit (4 kB/s storage)

+VSP

Voice Speakerphone State

<mode> Description

0 Speakerphone AEC, AES and LEC disabled.

Handset FIR filter coefficients are selected.

1 Speakerphone AEC, AES and LEC enabled.

Speakerphone FIR filter coefficients are selected.

The +VLS=13 command must be used in combination with this setting.

+VTD = n

DTMF / Tone Duration Timer.

This command sets the default DTMF / tone generation duration in 10 ms units for the +VTS

command. Default time is 1 second (n = 100).

Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued)

Command

Action

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