User`s manual

AT Command Reference Manual
1048 7-15
7.3.2 AT#V Commands Enabled Only in Voice Mode (#CLS=8)
The commands described in the following subsection are extensions to the command set which the modem recognizes only
when configured for Voice/Audio Mode with the #CLS=8 command.
#TL- Audio Output Transmit Level
This command provides adjustment of the transmit level of the data pump audio output, affecting both the playback level of
the handset and speaker and telephone line.
Note:
This command is not applicable to RC288 and ACF/SP products,
however, the command is accepted for command response compatibility only.
Parameters: n=0000 to 7FFF if the handset or speaker is selected
Default: 7FFF, if local handset or speaker is selected
3F44, if the phone line is selected
Result Codes:
OK If n=0000 to 7FFF
#VBQ? - Query Buffer Size
This query-only command returns the size of the modem's voice transmit and voice receive buffers in ASCII decimal,
followed by the OK result code.
Parameters: None
Command option:
#VBQ? Returns the size of the modem voice transmit and voice receive buffers.
#VBS - Bits Per Sample
This command selects the degree of ADPCM voice compression or format of linear PCM to be used.
Parameters: n = 2 or 4 (ADPCM Voice compression) bits/sample, or 8 (PCM) bits/sample
Default: 4
Result Codes:
OK If n=2, 4, or 8
ERROR Otherwise.
Command options:
#VBS? Returns the current setting of the #VBS command as an ASCII decimal value in result code
format.
#VBS=? Returns "2" or "4", which are the ADPCM compression bits/sample rates available, or "8" which is
the PCM bits/sample rate. The 2 and 4 bits/sample rates are correlated with the #VCI query
command response which provides the single compression method available. The "8" represents
8-bit unsigned linear PCM format, respectively.
#VBS=2 Selects 2 bits per sample ADPCM (valid for #VSR = 7200).
#VBS=4 Selects 4 bits per sample ADPCM (valid for #VSR = 7200).
#VBS=8 Selects 8 bits per sample PCM (valid for #VSR = 7200 or #VSR = 11025).