User`s manual

AT Command Reference Manual
1048 7-29
It is not necessary to enter all <mute>,<spkr>,<mic> options while issuing AT#SPK.
Examples:
AT#SPK= <mute>,,, Changes the <mute> setting
AT#SPK = ,<spkr>,, Changes the <spkr> setting
AT#SPK = ,, <mic> Changes the <mic> setting
AT#SPK = <mute>,<spkr>,, Changes the <mute> and <spkr> settings
AT#SPK = <mute>,,<mic> Changes the <mute> and <mic> settings
AT#SPK = ,<spkr>,<mic> Changes the <spkr> and <mic> settings
Room Monitor
The modem can be configured to a listen only mode where the microphone automatic gain control is set to maximum (50
dB). The feature is called Room Monitor and the allow an application where a remote caller calls the computer to monitor
what is happening the room. The following setting will enable Room Monitor mode.
AT#SPK=2,,,
Switching Between #VLS Settings
Switching between different #VLS settings during Voice On-line mod is permitted although only certain combinations may be
useful. The #VLS settings are grouped into local and remote. Switching between #VLS settings should be within either local
or remote groups.
Local #VLS settings are defined as the modem being on-hook and isolated from the telco line
during Voice On-line (VCON) mode. The local settings are #VLS=1, #VLS=2, #VLS=3, and #VLS=9. Remote #VLS settings
are defined as the modem being off-hook and connected to the telco line during Voice On-line mode. The remote settings
are #VLS=0, #VLS=4, #VLS=5, #VLS=6. #VLS=7, and #VLS=8.
Example 1
An example of how host software will switch #VLS settings in local mode is an application which records a greeting message
through the handset and review the message through the speaker. To accomplish this functionality, the modem is set to
#VLS=1 (local handset recording/playback) during the recording process and is switched to #VLS=2 (playback through
speaker) to monitor the playback.
Example 2
An example of how host software will switch #VLS settings in remote mode is a telephone answering application which has a
call screening mode. The application plays a greeting message with the speaker off (#VLS=0) and switches the speaker on
when recording the incoming message (#VLS=4). If the user decides to answer the call he picks up the handset (a <DLE>t
is reported to the software), the recording process will stop and the modem releases the line (ATH).
Reporting of Local Handset Status
The modem reports the off-hook to on-hook and on-hook to off-hook transition of the local handset by the <DLE>h and
<DLE>t characters, respectively. The handset status is reported after the issuing of the AT#CLS=8 command and updated
whenever transitions of the handset status are detected. This handset status reporting does not depend if the modem is in
Voice On-line (VCON) mode.
This is useful for auto dialer applications which need to know the handset transitions during and after the dialing process.