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Data Addendum Host-Based Controller Modem
June 15, 1998 AT Command Set
AT Voice Commands Reference (continued)
Version 1.0 Lucent Technologies Inc.
45
AT Commands: Speakerphone Operation
AT+VLS=<label> Analog Source/Destination Selection
This is a general purpose analog source/destination command that attaches various analog devices to the system
in voice mode.
✟ Speakerphone on: AT+VLS=7.
Attach internal speaker and internal microphone, DCE off-hook.
✟ Speakerphone off: AT+VLS=0.
Detach analog devices, DCE on-hook.
✟ Microphone Control/Phone Muting:
AT+VLS=5 disables/detaches microphone analog source (leaving speaker only) when speakerphone is in
operation (phone mute feature).
AT+VLS=7 restores/attaches microphone along with speaker (normal speakerphone operation).
AT+VLS? Reports the current analog source/destination configuration, along with a listing of all event codes
reported from the modem to the DTE under that configuration.
AT+VLS=? Queries the DCE for the range of supported configurations and the list of unsolicited event codes
that the modem will report to the DTE under each configuration. For speakerphone, the
configurations supported are 0, 5, and 7as explained above.
AT Commands: Telephone Answering Device
AT+VTD=<dur> Beep Tone Duration Timer
This command sets the default duration for DTMF/tone generation in 0.01 s increments.
For DTMF digits, beep tone duration is the interdigit time. For tone generation, this number is the actual tone
duration.
AT+VTS=<string> DTMF and Tone Generation in Voice Mode
This command will cause the modem to produce a sequence of DTMF tones (or other tones, such as dial tone,
busy, silence, etc.) as specified in the string parameter. Specifications for the format of tone strings are detailed
in IS-101.
■ AT+VTS? reports the current <string> parameter.
■ AT+VTS=? reports the range of frequencies supported for tone generation, as well as tone duration.
Example: (2003300), (2003300), (0500).
AT+VTR Start voice transmission and reception process
This command will cause DCE to start full duplex voice mode. In this mode, the DTE selects the analog source
and sink through the +VLS command; the selections can be microphone and speaker or GSTN. The DCE is not
required to perform any Acoustic Echo Cancellation nor any Line Echo Cancellation.