ACS COMPUTER GROUP ================== V.34 PLUG AND PLAY INTERNAL Card Type Modem (asynchronous) Chipset Unidentified I/O Options Voice, speakerphone Maximum Data Rate 33.6Kbps Maximum Fax Rate 14.4Kbps Data Bus 16-bit ISA Fax Class Class I Data Modulation Bell 103A/212A ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34 Fax Modulation ITU-T V.17, V.27ter, V.29 Error MNP5, V.42, V.42bis Correction/Compression +------------------------------------------------------------+ | CONNECTIONS | |------------------------------------------------------------| | Function | Label | Function | Label | |----------------------+-------+---------------------+-------| | Line in | CN1 | Line out | CN2 | +------------------------------------------------------------+ +------------------------------------------------------------+ | SUPPORTED STANDARD COMMANDS | |------------------------------------------------------------| | Basic AT Commands | |------------------------------------------------------------| | +++, 'comma', A/ | |------------------------------------------------------------| | A, E, H, L, M, N, O, P, Q, T, V, W, X, Y, Z | |------------------------------------------------------------| | &C, &D, &F, &G, &K, &P, &S, &T, &V, &W, &Y, &Z | |------------------------------------------------------------| | Extended AT Commands | |------------------------------------------------------------| | \A, \B, \G, \K, \L, \N | |------------------------------------------------------------| | %C, %E, %L, %Q | |------------------------------------------------------------| | Special AT Commands | |------------------------------------------------------------| | #CID | |------------------------------------------------------------| | S-Registers | |------------------------------------------------------------| | S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, | | S18, S25, S30, S32, S33, S38, S91 | |------------------------------------------------------------| | Note: See MHI documentation for complete information. | +------------------------------------------------------------+ Proprietary AT Command Set +------------------------------------------------------------+ | COMMUNICATION PROTOCOLS | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] Bn [cmds] | |--------------+---------------------------------------------| | Description: | Selects the communication protocol for | | | low-speed data calls. | |--------------+---------------------------------------------| | Command | Protocol | |--------------+---------------------------------------------| | B0 | Modem will use ITU-T V.22 at 300 or | | | 1200bps. | |--------------+---------------------------------------------| | i B1 | Modem will use Bell 212A at 300 or 1200bps. | |--------------+---------------------------------------------| | B2 | Modem will use V.23 at 1200bps. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CONNECTION FAILURE CODE | |------------------------------------------------------------| | Type: | Register | |--------------+---------------------------------------------| | Format | AT [cmds] S86? [cmds] | |--------------+---------------------------------------------| | Description: | Displays a code which corresponds to the | | | reason the connection failed. | |--------------+---------------------------------------------| | Value | Meaning | |--------------+---------------------------------------------| | 0 | No failure - normal hang up. | |--------------+---------------------------------------------| | 4 | Carrier signal lost. | |--------------+---------------------------------------------| | 5 | No error-control detected for remote modem | | | during feature negotiation. | |--------------+---------------------------------------------| | 6 | Remote modem failed to respond to feature | | | negotiation. | |--------------+---------------------------------------------| | 9 | No common protocol found. | |--------------+---------------------------------------------| | 12 | No failure - remote modem disconnected | | | normally. | |--------------+---------------------------------------------| | 13 | Remote modem failed to respond after 10 | | | re-transmissions same message. | |--------------+---------------------------------------------| | 14 | Violation of negotiated protocol caused | | | failure. | |--------------+---------------------------------------------| | 20 | Inactivity time out. | +------------------------------------------------------------+ +------------------------------------------------------------+ | DIAL | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] D<#>;[cmds] | |--------------+---------------------------------------------| | Description: | Dials the telephone number indicated | | | according to any modifiers included in the | | | string. | |--------------+---------------------------------------------| | Note: | Any combination of modifiers can be used to | | | produce the desired dial functions in | | | sequence. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | DL | Re-dial last number. | |--------------+---------------------------------------------| | DP | Pulse dialing enabled. | |--------------+---------------------------------------------| | DSn | Dial stored telephone number n. | |--------------+---------------------------------------------| | DT | Tone dialing enabled. | |--------------+---------------------------------------------| | DW | Dialing resumed following dial tone | | | detection. | |--------------+---------------------------------------------| | D, | Dialing paused for amount of time specified | | | in S8 register. | |--------------+---------------------------------------------| | D! | Flash function initiated. Modem commanded | | | to go off-hook for specified time before | | | returning on-hook. | +------------------------------------------------------------+ +------------------------------------------------------------+ | DIAL (CON'T) | |------------------------------------------------------------| | Command | Function | |---------+--------------------------------------------------| | D@ | Wait for Quiet Answer function enabled. Modem | | | waits until a "quiet answer," a ring-back signal | | | followed by silence up to the time specified in | | | S7, is received prior to executing the rest of | | | the dial string. | |---------+--------------------------------------------------| | D^ | Enable calling tone for this call. | |---------+--------------------------------------------------| | D; | Modem returned to idle state after dialing. The | | | semicolon can only be placed at the end of the | | | dial command. | +------------------------------------------------------------+ +------------------------------------------------------------+ | DISPLAY INFORMATION | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] In [cmds] | |--------------+---------------------------------------------| | Description: | Displays information requested about the | | | modem. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | I0 | Displays product identification code. | |--------------+---------------------------------------------| | I1 | Displays ROM checksum. | |--------------+---------------------------------------------| | I2 | Displays internal code. | |--------------+---------------------------------------------| | I3 | Displays firmware revision. | |--------------+---------------------------------------------| | I4 | Displays product features. | +------------------------------------------------------------+ +------------------------------------------------------------+ | DISPLAY MANUFACTURER | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] #MFR? [cmds] | |--------------+---------------------------------------------| | Description: | Displays the chipset manufacturer's name. | +------------------------------------------------------------+ +------------------------------------------------------------+ | DISPLAY MODEL NAME | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] #MDL? [cmds] | |--------------+---------------------------------------------| | Description: | Displays the model name of the modem. | +------------------------------------------------------------+ +------------------------------------------------------------+ | DISPLAY REVISION | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] #REV? [cmds] | |--------------+---------------------------------------------| | Description: | Displays the revision level of the modem. | +------------------------------------------------------------+ +------------------------------------------------------------+ | HELP | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] &$ [cmds] | |--------------+---------------------------------------------| | Description: | Displays a help screen of all ampersand | | | commands. | +------------------------------------------------------------+ +------------------------------------------------------------+ | LINE SPEED | |------------------------------------------------------------| | Type: | Register | |--------------+---------------------------------------------| | Format | AT [cmds] S37=n [cmds] | |--------------+---------------------------------------------| | Description: | Sets the maximum connect speed attempted | | | during handshake process. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | i S37=0 | Attempt fastest speed connection possible. | |--------------+---------------------------------------------| | S37=3 | Attempt to connect at 300bps. | |--------------+---------------------------------------------| | S37=4 | Attempt to connect at 1200bps. | |--------------+---------------------------------------------| | S37=6 | Attempt to connect at 2400bps. | |--------------+---------------------------------------------| | S37=7 | Attempt to connect at 4800bps. | |--------------+---------------------------------------------| | S37=8 | Attempt to connect at 7200bps. | |--------------+---------------------------------------------| | S37=9 | Attempt to connect at 9600bps. | |--------------+---------------------------------------------| | S37=10 | Attempt to connect at 12Kbps. | |--------------+---------------------------------------------| | S37=11 | Attempt to connect at 14.4Kbps. | |--------------+---------------------------------------------| | S37=12 | Attempt a V.34 connection. | +------------------------------------------------------------+ +------------------------------------------------------------+ | MODE SELECTION | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] #CLS=n [cmds] | |--------------+---------------------------------------------| | Description: | Selects which mode the modem will operate | | | in. | |------------------------------------------------------------| | Command | Function | |----------------+-------------------------------------------| | #CLS=0 | Modem will operate in data mode. | |----------------+-------------------------------------------| | #CLS=1 | Modem will operate in fax class I mode. | |----------------+-------------------------------------------| | #CLS=8 | Modem will operate in voice mode. | +------------------------------------------------------------+ +------------------------------------------------------------+ | SPEAKERPHONE OPTIONS | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] #SPK=x,y,z [cmds] | |--------------+---------------------------------------------| | Description: | Sets various options for speakerphone | | | functions. | |------------------------------------------------------------| | Command | Function | |---------------+--------------------------------------------| | x=0 | Microphone disabled. | |---------------+--------------------------------------------| | x=1 | Microphone enabled. | |---------------+--------------------------------------------| | x=2 | Microphone enabled with maximum gain, | | | speaker disabled. | |------------------------------------------------------------| | Default (y): | 5 | |--------------+---------------------------------------------| | Range (y): | 0 - 16 | |--------------+---------------------------------------------| | Unit (y): | -2 dBm | |--------------+---------------------------------------------| | Description | Sets the attenuation level for speaker | | (y): | output in voice mode. | |------------------------------------------------------------| | z=0 | Microphone gain set to 0 dBm. | |---------------+--------------------------------------------| | z=1 | Microphone gain set to 6 dBm. | |---------------+--------------------------------------------| | z=2 | Microphone gain set to 9.5 dBm. | |---------------+--------------------------------------------| | z=3 | Microphone gain set to 12 dBm. | +------------------------------------------------------------+ +------------------------------------------------------------+ | TONE DETECTION | |------------------------------------------------------------| | Format: | AT [cmds] #VTD=x,y,z [cmds] | |----------------+-------------------------------------------| | Default: | x,y,z 63 | |----------------+-------------------------------------------| | Range: | 0 - 63 | |----------------+-------------------------------------------| | Description: | Sets which tones the tone detection will | | | report. | |----------------+-------------------------------------------| | Note: | The value of x sets the tone detection | | | modes in voice transmit mode, y sets them | | | in voice receive mode, and z sets them in | | | voice command mode. | |------------------------------------------------------------| | Bit | Value | Function | |---------+-------+------------------------------------------| | 0 | 0 | DTMF tones are not detected. | | | | | | | i 1 | DTMF tones are detected. | |------------------------------------------------------------| | 1 | 0 | V.25 1300Hz calling tone is not | | | | detected. | | | i | | | | 1 | V.25 1300Hz calling tone is detected. | |-------------+----+-----------------------------------------| | 2 | 0 | T.30 1100Hz fax tone is not detected. | | | | | | | i | T.30 1100Hz fax tone is detected. | | | 1 | | |-------------+----+-----------------------------------------| | 3 | 0 | V.25/T.30 2100Hz answer tone is not | | | | detected. | | | i | | | | 1 | V.25/T.30 2100Hz answer tone is | | | | detected. | |-------------+----+-----------------------------------------| | 4 | 0 | Bell 2225Hz answer tone is not | | | | detected. | | | i | | | | 1 | Bell 2225Hz answer tone is detected. | |-------------+----+-----------------------------------------| | 5 | 0 | Call progress tones are not detected. | | | | | | | i | Call progress tones are detected. | | | 1 | | +------------------------------------------------------------+ +------------------------------------------------------------+ | TONE GENERATOR - DIRECT ENTRY | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] #VTS=[m, n, x] | |--------------+---------------------------------------------| | Range: | m 2000-3000, n 2000-3000, x 0-255 | |--------------+---------------------------------------------| | Unit: | m 1 Hz, n 1 Hz, x .1 second | |--------------+---------------------------------------------| | Description: | Generates a dual-frequency tone for | | | duration x at frequencies m and n. | | | Specifying a 0 for one frequency will | | | generate a single-frequency tone. | +------------------------------------------------------------+ +------------------------------------------------------------+ | TONE GENERATOR - TIMED PHONE KEYS | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] #VTS={a, n} | |--------------+---------------------------------------------| | Range: | a 0-9, A-D, #, *; x 0-255 | |--------------+---------------------------------------------| | Unit: | x .1 second | |--------------+---------------------------------------------| | Description: | Generates the DTMF tone for duration x for | | | the character a. | +------------------------------------------------------------+ +------------------------------------------------------------+ | TONE GENERATOR - PHONE KEYS | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] #VTS=a | |--------------+---------------------------------------------| | Range: | 0-9, A-D, #, * | |--------------+---------------------------------------------| | Description: | Generates the DTMF tones for the characters | | | in the string for the duration set with | | | +VBT. | +------------------------------------------------------------+ +------------------------------------------------------------+ | TONE GENERATOR LENGTH | |------------------------------------------------------------| | Format | AT [cmds] #VBT=n [cmds] | |--------------+---------------------------------------------| | Default: | 10 | |--------------+---------------------------------------------| | Range: | 0 - 40 | |--------------+---------------------------------------------| | Unit: | 0.1 second | |--------------+---------------------------------------------| | Description: | Sets the length of DTMF tones that are | | | generated. | +------------------------------------------------------------+ +------------------------------------------------------------+ | TRELLIS CODING | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] &Un [cmds] | |--------------+---------------------------------------------| | Description: | Selects whether the modem will use trellis | | | coding. | |------------------------------------------------------------| | Command | Function | |-----------------------+------------------------------------| | i &U0 | Trellis coding enabled. | |-----------------------+------------------------------------| | &U1 | Trellis coding disabled. | +------------------------------------------------------------+ +------------------------------------------------------------+ | V.34 MINIMUM BAUD RATE | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] S35=n [cmds] | |--------------+---------------------------------------------| | Description: | Selects the minimum baud rate for V.34 | | | mode. | |------------------------------------------------------------| | Command | Function | |---------------------+--------------------------------------| | i S35=0 | Minimum baud rate is 2400 baud. | |---------------------+--------------------------------------| | S35=1 | Minimum baud rate is 2743 baud. | |---------------------+--------------------------------------| | S35=2 | Minimum baud rate is 2800 baud. | |---------------------+--------------------------------------| | S35=3 | Minimum baud rate is 3000 baud. | |---------------------+--------------------------------------| | S35=4 | Minimum baud rate is 3200 baud. | |---------------------+--------------------------------------| | S35=5 | Minimum baud rate is 3429 baud. | +------------------------------------------------------------+ +------------------------------------------------------------+ | V.34 LINE SPEED | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] S34=n [cmds] | |--------------+---------------------------------------------| | Description: | Selects what speed the modem will attempt | | | to connect at in V.34 mode. | |------------------------------------------------------------| | Command | Function | |---------------+--------------------------------------------| | S34=0 | Modem will attempt to connect at 2400bps | | | in V.34 mode. | |---------------+--------------------------------------------| | S34=1 | Modem will attempt to connect at 4800bps | | | in V.34 mode. | |---------------+--------------------------------------------| | S34=2 | Modem will attempt to connect at 7200bps | | | in V.34 mode. | |---------------+--------------------------------------------| | S34=3 | Modem will attempt to connect at 9600bps | | | in V.34 mode. | |---------------+--------------------------------------------| | S34=4 | Modem will attempt to connect at 12Kbps in | | | V.34 mode. | |---------------+--------------------------------------------| | S34=5 | Modem will attempt to connect at 14.4Kbps | | | in V.34 mode. | |---------------+--------------------------------------------| | S34=6 | Modem will attempt to connect at 16.8Kbps | | | in V.34 mode. | |---------------+--------------------------------------------| | S34=7 | Modem will attempt to connect at 19.2Kbps | | | in V.34 mode. | |---------------+--------------------------------------------| | S34=8 | Modem will attempt to connect at 21.6Kbps | | | in V.34 mode. | |---------------+--------------------------------------------| | S34=9 | Modem will attempt to connect at 24Kbps in | | | V.34 mode. | |---------------+--------------------------------------------| | S34=10 | Modem will attempt to connect at 26.4Kbps | | | in V.34 mode. | |---------------+--------------------------------------------| | S34=11 | Modem will attempt to connect at 28.8Kbps | | | in V.34 mode. | |---------------+--------------------------------------------| | S34=12 | Modem will attempt to connect at 31.2Kbps | | | in V.34 mode. | |---------------+--------------------------------------------| | i S34=13 | Modem will attempt to connect at 33.6Kbps | | | in V.34 mode. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE BUFFER SPACE | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] #VSK=n [cmds] | |--------------+---------------------------------------------| | Default: | 255 | |--------------+---------------------------------------------| | Range: | 0 - 255 | |--------------+---------------------------------------------| | Unit: | 1 byte | |--------------+---------------------------------------------| | Description: | Sets the amount of data the modem can send | | | into the buffer after the XOFF signal is | | | sent. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE - DISPLAY BUFFER SIZE | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] #VBQ? [cmds] | |--------------+---------------------------------------------| | Description: | Displays the size of the voice buffer. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE - DISPLAY COMPRESSION TYPE | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] #VCI? [cmds] | |--------------+---------------------------------------------| | Description: | Displays the type of compression currently | | | in use. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE DEVICE | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] #VLS=n [cmds] | |--------------+---------------------------------------------| | Description: | Selects the I/O device for the DSP chip. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | i #VLS=0 | Telephone line and handset used for voice | | | I/O. | |--------------+---------------------------------------------| | #VLS=1 | Telephone handset used for voice I/O. | |--------------+---------------------------------------------| | #VLS=2 | Internal speaker only used for voice I/O. | |--------------+---------------------------------------------| | #VLS=4 | Telephone line and handset used for voice | | | I/O; internal speaker enabled. | |--------------+---------------------------------------------| | #VLS=6 | Speakerphone used for voice I/O. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE - LOCAL SERIAL PORT SPEED | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] #BDR=n [cmds] | |--------------+---------------------------------------------| | Default: | 0 | |--------------+---------------------------------------------| | Range: | 0 - 48 | |--------------+---------------------------------------------| | Unit: | 2400 bps | |--------------+---------------------------------------------| | Description: | Sets the speed of the local serial port | | | when in voice mode. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE RECORD GAIN | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] #RG=hhhh [cmds] | |--------------+---------------------------------------------| | Default: | 7FFF | |--------------+---------------------------------------------| | Range: | 0000 - 7FFF | |--------------+---------------------------------------------| | Unit: | Unidentified (hexadecimal) | |--------------+---------------------------------------------| | Description: | Sets the gain level for recording in voice | | | mode. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE RE-RING DETECT TIME | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] #VRA=n [cmds] | |--------------+---------------------------------------------| | Default: | 70 | |--------------+---------------------------------------------| | Range: | 0-255 | |--------------+---------------------------------------------| | Unit: | 10 mS | |--------------+---------------------------------------------| | Description: | Sets the maximum time the modem will wait | | | for the remote station to ring again before | | | it assumes that it has gone off-hook. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE RECEIVE | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] #VRX | |--------------+---------------------------------------------| | Description: | Commands the modem to begin receiving voice | | | data. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE RING DETECT TIME | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] #VRN=n [cmds] | |--------------+---------------------------------------------| | Default: | Unidentified | |--------------+---------------------------------------------| | Range: | 0 - 255 | |--------------+---------------------------------------------| | Unit: | 10 mS | |--------------+---------------------------------------------| | Description: | Sets the maximum time the modem will wait | | | for the remote station to ring before it | | | assumes that it went off-hook before it | | | rang. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE SILENCE DETECTION TIME | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] #VSP=n [cmds] | |--------------+---------------------------------------------| | Default: | 55 | |--------------+---------------------------------------------| | Range: | 0 - 255 | |--------------+---------------------------------------------| | Unit: | .1 second | |--------------+---------------------------------------------| | Description: | Sets the minimum amount of silence that the | | | modem will detect. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE SILENCE DETECTION THRESHOLD | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] #VSS=n [cmds] | |--------------+---------------------------------------------| | Description: | Sets the threshold of sensitivity that the | | | modem uses to determine silence detection. | |------------------------------------------------------------| | Command | Function | |----------------+-------------------------------------------| | #VSS=0 | Silence detection disabled. | |----------------+-------------------------------------------| | #VSS=1 | Minimum silence detection sensitivity. | |----------------+-------------------------------------------| | i #VSS=2 | Standard silence detection sensitivity. | |----------------+-------------------------------------------| | #VSS=3 | Maximum silence detection sensitivity. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE TRANSMISSION GAIN LEVEL | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] #TL=hhhh [cmds] | |--------------+---------------------------------------------| | Default: | 3FFF | |--------------+---------------------------------------------| | Range: | 0000 - 7FFF | |--------------+---------------------------------------------| | Unit: | Unidentified (hexadecimal) | |--------------+---------------------------------------------| | Description: | Sets the gain level for sending audio in | | | voice mode. | +------------------------------------------------------------+ +------------------------------------------------------------+ | VOICE TRANSMIT | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] #VTX | |--------------+---------------------------------------------| | Description: | Commands the modem to begin transmitting | | | voice data. | +------------------------------------------------------------+