Motorola UbiSurf SM56 At Commands Reference Manual page 26

Table 4: AT+ (Plus) Commands
-24
Command Command Option Option
Command Command Option Option
+VRX or
+VRX=0
+VRX=1
+VSD
Data/Fax/Speakerphone modem only
+VSD=m,n
m options:
0
127
128
129
n options:
0
1-255
60
+VSM
Data/Fax/Speakerphone modem only
+VSM=m,n,
p,q
m options:
128
129
n options:
8000
Motorola Confidential Proprietary
Description Description
Description Description
Determines whether the modem generates a periodic
beep, audible to both parties on the speakerphone,
indicating that the call is being recorded.
Note
The speakerphone state does not have to be reset
after recording to the line or playing a message
to the line. The baud rate is not set before the
StartPlay and StartRecord commands. The baud
rate is not reset after the StopPlay and
StopRecord commands.
Produce Periodic DCE Tone While Recording
Disable Periodic DCE Tone Production During
Recording
Remote Silence-Detection Properties
Used in answering-machine mode. Specifies the vol-
ume and duration thresholds that determine whether
the remote device has hung up.
Specifies the silence-detection level
Use current +VSM value; or, if current +VSM value
is 0, use 128.
Low Threshold (most sensitive)
Medium Threshold
High Threshold (least sensitive)
Specifies the silence-detection duration
Disable
Detect n/10 seconds silence; n = 0-255
Default = 6 seconds
Speech Compression Properties
Specifies the speakerphone compression parameters
Specifies the compression method
PCM
ADPCM
Specifies the sampling rate to determine whether to
compress
8000 Hz