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The following table lists the voice AT commands that your modem understands, including Speakerphone commands and Telephone Answering Machine (TAM) commands. Each command description names the command, explains it, and lists any associated parameters.

VOICE COMMANDS
Command Description
+FCLASS=8 Enter Voice Mode. AT+FCLASS=8 puts the modem in voice mode. Speakerphone and TAM modes are included under the more general heading of Voice Mode and use a particular subset of voice mode commands to implement their respective features and functions. The modem controller will maintain the overall state of the system so as to know when voice commands are issued in the context of using the speakerphone versus TAM or other voice contexts.
+FCLASS? Return Current Modem Mode.
+FCLASS=? Return Supported Modem Modes. AT+FCLASS=? queries the modem for the range of modes supported. The modem returns: 0, 1, 8, 80 (data, fax, voice, VoiceView).
+FMI? Modem Manufacturer Identification. AT+FMI? instructs the modem to identify its manufacturer.
+FMM? Modem Product Identification. AT+FMM? instructs the modem to report its product identification.
+FMR Modem Revision Identification. AT+FMR? instructs the modem to report its revision level or other pertinent information.
+VIP Initialize Voice Parameters. AT+VIP causes the modem to initialize all voice parameters to their default values.
+VCID=n Caller ID. AT+VCID enables/disables caller identification.

Parameters: n = 0, 1, 2

n = 0 Disable Caller ID

n = 1 Enable Caller ID, formatted caller report

n = 2 Enable Caller ID, unformatted caller report

NOTE: Caller ID is not available in some countries.

+VCID? Return Current Caller ID Mode.

NOTE: Caller ID is not available in some countries.

+VCID=? Return Supported Caller ID Report Formats. AT+VCID=? queries the modem for the range of supported Caller ID report formats.

NOTE: Caller ID is not available in some countries.

+VDR=<enable>, <report> Distinctive Ringing and Cadence Report. AT+VDR enables the distinctive ringing feature. Distinctive ringing allows a report of DROF/DRON to follow an exact ring cadence coming over the phone line.

NOTE: Distinctive ringing is not available in some countries.

+VDR? Return Distinctive Ringing and Cadence Report Values. AT+VDR? returns the current values of <enable> and <report>.

NOTE: Distinctive ringing is not available in some countries.

+VDR=? Return Supported Distinctive Ringing and Cadence Report Configurations. AT+VDR=? queries the modem for the range of supported distinctive ring configurations. The modem returns (0,1), (0-255).

NOTE: Distinctive ringing is not available in some countries.

+VGT=n Speaker Volume Control.

Range: 0 - 255

n = 0 Modem automatic volume control

n = 128 Nominal volume level for sending to speaker

n > 128 Increase volume above nominal level

n < 128 Decrease volume below nominal level

AT+VGT? Returns the current speaker volume level

AT+VGT=? Returns the range of supported levels

+VGR=n Receive Gain Selection. AT+VGR=n enables the receive microphone gain control.

Range: 0 - 255

n = 128 Nominal level for receive gain from microphone

n > 128 Increase gain above nominal level

n < 128 Decrease gain below nominal level

TAM mode. This command may be used in TAM local recording to control the recording level from the microphone.

Speakerphone mode. This command may be used to control the gain from the microphone to the remote caller.

AT+VGR? Returns the current gain level

AT+VGR=? Returns the range of supported gain values

+VEM=n Event Reporting and Masking. The computer uses the AT+VEM=n command to disable an event report regardless of the modem state, analog signal source, or destination configuration.

Mask is bits 0 - 33 (i.e., FFFFFFFFC). See the IS-101 specification for defined bit values.

AT+VEM? Returns the current values of the mask

AT+VEM=? Queries the modem for the range of supported service level events

+VIT=n DTE/DCE (computer/modem) Inactivity Timer. The AT+VIT=n command sets the modem's value for the DTE/DCE inactivity timer. This timer is initiated after a logical hang-up described by the AT+VNH=2 command. At the end of the selected inactivity period, the modem performs a physical hang-up and returns to +FCLASS=0. The timer, n, is incremented in one-second units.

+VIT? Returns the current DTE/DCE inactivity timer value

+VIT=? Returns the supported range of DTE/DCE inactivity timer values

+VNH=n Automatic Hang-up Control. The AT+VNH=n command causes the modem to enable or disable automatic hang-ups in the data and facsimile modes. See the ISO-101 specification for a detailed description of this command and its interaction with the +FCLASS and ATH commands.

Parameters: n = 0, 1

n = 0 Enable automatic hang-ups (default)

n = 1 Disable automatic hang-ups in the data and facsimile modes. The computer performs a logical hang-up; the modem performs a logical hang-up and returns the OK result code.

Voice Commands Related to Speakerphone
Command Description
+VLS=n Analog Source/Destination Selection. General purpose analog source/destination command that attaches various analog devices to the system in voice mode.

Speakerphone On/Off

n = 0 Speakerphone off. Detaches analog devices, modem on-hook

n = 7 Speaker phone on. Attaches internal speaker and internal microphone, modem off-hook

Microphone Control/Phone muting

n = 5 Disables/detaches microphone analog source (leaving speaker only) when speakerphone is in operation (phone mute feature)

n = 7 Restores/attaches microphone along with speaker (normal speakerphone operation)

+VLS? Report Current Analog Source/Destination Configuration. AT+VLS? reports the current analog source/destination configuration, along with a listing of all event codes reported from the modem to the computer under that configuration.
+VLS=? Report Supported Analog Source/Destination Configurations. AT+VLS=? queries the modem for the range of supported configurations and the list of unsolicited event codes that the modem will report to the computer under each configuration. For speakerphone, the configurations supported are 0, 5, 7.
Voice Commands Related to Telephone Answering Machine (TAM)
Command Description
+VTD=n Beep Tone Duration Timer. AT+VTD=n sets the default duration for DTMF/tone generation (set in 0.01 second units).
+VTS=n DTMF and Tone Generation in Voice Mode. AT+VTS=n causes the modem to produce a sequence of DTMF tones (or other tones, such as dialtone, busy, silence) as specified in the parameter string. Specifications for the tone strings are detailed in IS-101.
+VLS=n Analog Source/Destination Selections. TAM supports each of the following IS-101 analog source/destination configurations:

n = 0 Modem on-hook, local phone connected to Telco

n = 1 Modem off-hook, modem connected to Telco

n = 2 Modem off-hook, local phone connected to modem

n = 3 Modem off-hook, local phone connected to Telco, modem to local phone

n = 4 Speaker connected to modem, modem on-hook (playback messages)

n = 5 Speaker connected to modem, modem off-hook (call screening)

n = 6 Microphone connected to modem, modem on-hook (record greeting)

n = 7 Microphone and speaker connected, modem off-hook (speakerphone)

+VLS=? Analog Source/Destination Selection and DTMF/Tone Reporting. Requests for the modem's DTMF/Tone reporting capabilities are made using the AT+VLS=? command. For each system configuration in voice mode (speakerphone and answering machine), the modem reports the capabilities that are enabled for the configuration. For each configuration, the modem indicates tone-reporting capabilities for each of the three different voice states: Voice Transmit Data, Voice Receive Data, and Voice Command State.
+VSD=<sds>, <sdi> Silence Detection (QUIET and SILENCE). The AT+VSD=<sds>, <sdi> command sets both the silence detection sensitivity <sds> and the silence detection interval <sdi>. Larger values of <sds> indicate that the modem is to treat noisier line conditions as silence. Default is -40 dBm.

<sds>=128 is the nominal level of sensitivity. <sds> greater than 128 is more aggressive; <sds> = 129 is -39 dBM. <sds> less than 128 is less aggressive; <sds> = 127 is -41 dBm.

The <sdi> specifies the amount of time the modem waits before reporting silence to the computer. It is used to determine the presumed hang-up (SILENCE), after which the modem sends <DLE>-s to computer. Default is 5 seconds.

+VSM=cml,vsr Compression Method and Sampling Specifications. AT+VSM=cml,vsr enables the compression method and sampling specifications where cml=compression method label and vsr=voice sampling rate.
+VSM? Return Current Compression Method and Sampling Specifications. AT+VSM? returns the numeric and string labels of the compression method currently in use and the sampling rate currently in use.
+VSM=? Return Supported Compression Method and Sampling Specifications. The modem reports the voice compression methods it supports and the voice sampling rates at which they are supported:

128, 8-bit linear, (7200, 8000, 11025)

129, 16-bit linear, (7200, 8000, 11025) (default)

130, 8-bit A-law, (8000)

131, 8-bit Ž-law, (8000)

132, IMA ADPCM, (8000)

+VRA=n Ringback Goes Away Timer. The modem uses the ringback goes away timer when originating a call. This command sets this timer to the amount of time the modem waits between ringbacks before assuming that the remote modem has gone off-hook.
+VRN=n Ringback Never Appeared Timer. The modem uses this ringback never appeared timer when originating a call. The AT+VRN command sets this timer to the amount of time that the modem spends looking for an initial ringback. If a ringback is not detected within this interval, the modem assumes that the remote modem has gone off-hook.

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