Digicom GSM Bulk User Manual page 31

4.2.4 VOICE COMMANDS
GSM Bulk can call another voice device with the ATD<number>; command:
e.g. ATD0123456789;
When the remote device answers the call, GSM Bulk will show the OK message.
For the voice functionality, GSM Bulk is equipped with a double-ended audio interface on RJ6
female connector with the same Pin-out of a standard telephone handset.
The interface can be connected both to a handset and to a loud speaking telephone.
In order to improve the quality of the voice it will be necessary to modify some parameters to delete
the echo, the noise, etc. In this paragraph you can find the commands necessary to improve the
voice quality. To save the configuration use the AT&W command.
AT+SPEAKER
With a single command, you can set the factory parameters of the commands: AT+VGR, AT+VGT,
etc; in this way you can quickly improve the quality of the voice.
Note: Act also on AT+VGR, AT+CGT, commands to improve the quality of the voice.
Command
AT+SPEAKER=0
AT+SPEAKER=1
AT+SPEAKER?
Default: AT+SPEAKER=0
AT+CMUT
During a voice connection, this command disables the microphone while the speaker is always
active.
Command
AT+CMUT=0
AT+CMUT=1
AT+CMUT?
Default: AT+CMUT=0
AT+VTS
During a voice connection, this command sends the DTMF tones, to allow the surfing in vocal
servers.
Note: wait always the OK, before sending another tone.
Command
AT+VTS=<DTMF>
<DTMF> DTMF Tones
0...9 Numbers from 0 to 9
# # character
* Asterisk character
A...D A, B, C, D characters
Speaker and Microphone selection
Possible answers
OK
OK
+SPEAKER: 0
Mute Control
Possible answers
OK
OK
+CMUT: 0
Send DTMF tones
Possible answers
OK / ERROR
Action
Configuration for "telephone handset"
Configuration for "loud speaking telephone"
Shows the current settings
Action
Microphone enabled
Microphone disabled (MUTE)
Shows the current settings
Action
Send the specified DTMF tone
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