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       # APACHE MICRO PERIPHERALS, INC.
       
          APACHE V34IV-SP+
       
          Card Type              Modem (synchronous/asynchronous)        
          Chip Set               Unidentified                            
          I/O Options            Voice, speakerphone                     
          Maximum Data Rate      33.6Kbps                                
          Maximum Fax Rate       14.4Kbps                                
          Data Bus               Unidentified                            
          Fax Class              Class I & II                            
          Data Modulation        Bell 103A/212A                          
          Protocol                                                       
                                 ITU-T V.21, V.22, V.22bis, V.23, V.32,  
                                 V.32bis, V.34                           
                                                                         
                                 Rockwell V.FC                           
          Fax Modulation         Unidentified                            
          Protocol               
          Error                  MNP5, V.42, V.42bis, RPI                
          Correction/Compression 
       
                                                                   52997
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Setting               | Label |   Position   |
          |-------------------------------------+-------+--------------|
          | í Factory configured - do not alter | SW1/7 | Unidentified |
          |-------------------------------------+-------+--------------|
          | í Factory configured - do not alter | SW1/8 |     N/A      |
          |------------------------------------------------------------|
          |      Note: SW1/8 may not be present on all models.         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    INTERRUPT SELECTION                     |
          |------------------------------------------------------------|
          |  Setting   |   SW1/1   |   SW1/2   |   SW1/3   |   SW1/4   |
          |------------+-----------+-----------+-----------+-----------|
          |   í IRQ3   |    Off    |    Off    |    Off    |    On     |
          |------------+-----------+-----------+-----------+-----------|
          |    IRQ4    |    Off    |    Off    |    On     |    Off    |
          |------------+-----------+-----------+-----------+-----------|
          |    IRQ5    |    Off    |    On     |    Off    |    Off    |
          |------------+-----------+-----------+-----------+-----------|
          |    IRQ7    |    On     |    Off    |    Off    |    Off    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               SERIAL PORT ADDRESS SELECTION                |
          |------------------------------------------------------------|
          |      Setting       |       SW1/5       |       SW1/6       |
          |--------------------+-------------------+-------------------|
          |    3F8h (COM1:)    |        On         |        On         |
          |--------------------+-------------------+-------------------|
          |    2F8h (COM2:)    |        Off        |        On         |
          |--------------------+-------------------+-------------------|
          |    3E8h (COM3:)    |        On         |        Off        |
          |--------------------+-------------------+-------------------|
          |   í 2E8h (COM4:)   |        Off        |        Off        |
          +------------------------------------------------------------+
       
          +------------------------------+
          | MISCELLANEOUS TECHNICAL NOTE |
          |------------------------------|
          | Diagram not available.       |
          +------------------------------+
       
          +------------------------------------------------------------+
          |                SUPPORTED STANDARD COMMANDS                 |
          |------------------------------------------------------------|
          |                     Basic AT Commands                      |
          |------------------------------------------------------------|
          | +++, ‘comma’, A/                                           |
          |------------------------------------------------------------|
          | A, B, D, E, H, L, M, N, O, P, Q, T, V, W, X, Y             |
          |------------------------------------------------------------|
          | &C, &D, &F, &G, &K, &M, &P, &Q, &R, &S, &T, &V, &W, &X,    |
          | &Y, &Z                                                     |
          |------------------------------------------------------------|
          |                    Extended AT Commands                    |
          |------------------------------------------------------------|
          | \A, \B, \K, \N, \V                                         |
          |------------------------------------------------------------|
          | %C, %E, %F, %L, %Q, %TT                                    |
          |------------------------------------------------------------|
          |                    Special AT Commands                     |
          |------------------------------------------------------------|
          | #CID, +MS                                                  |
          |------------------------------------------------------------|
          |                        S-Registers                         |
          |------------------------------------------------------------|
          | The S-registers are unidentified.                          |
          |------------------------------------------------------------|
          |      Note: See MHI documentation for complete information. |
          +------------------------------------------------------------+
       
                            Proprietary AT Command Set
       
          +------------------------------------------------------------+
          |                    DISPLAY MANUFACTURER                    |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] #MFR? [cmds]                      |
          |--------------+---------------------------------------------|
          | Description: | Displays the 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.   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      DISTINCTIVE RING                      |
          |------------------------------------------------------------|
          | Format:        | AT [cmds] -SDR=n [cmds]                   |
          |----------------+-------------------------------------------|
          | Default:       | Unidentified                              |
          |----------------+-------------------------------------------|
          | Range:         | 0 - 7                                     |
          |----------------+-------------------------------------------|
          | Description:   | Selects which distinctive ring signals    |
          |                | the modem will respond to.                |
          |------------------------------------------------------------|
          |   Bit   | Value |                 Function                 |
          |---------+-------+------------------------------------------|
          |    0    |     0 | Do not respond to distinctive ring type  |
          |         |       | 1.                                       |
          |         |     1 |                                          |
          |         |       | Respond to distinctive ring type 1.      |
          |------------------------------------------------------------|
          |      1      |  0 | Do not respond to distinctive ring type |
          |             |    | 2.                                      |
          |             |  1 |                                         |
          |             |    | Respond to distinctive ring type 2.     |
          |-------------+----+-----------------------------------------|
          |      2      |  0 | Do not respond to distinctive ring type |
          |             |    | 3.                                      |
          |             |  1 |                                         |
          |             |    | Respond to distinctive ring type 3.     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         DSVD MODE                          |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] -SSE=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Select whether the modem will use DSVD      |
          |              | mode.                                       |
          |------------------------------------------------------------|
          |          Command          |            Function            |
          |---------------------------+--------------------------------|
          |         í -SSE=0          | DSVD mode disabled.            |
          |---------------------------+--------------------------------|
          |          -SSE=1           | DSVD mode enabled.             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     FIRMWARE DOWNLOAD                      |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] **n [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Downloads new code to the firmware flash    |
          |              | memory.                                     |
          |------------------------------------------------------------|
          |     Command     |                 Function                 |
          |-----------------+------------------------------------------|
          |       **0       | Download at speed of last command.       |
          |-----------------+------------------------------------------|
          |       **1       | Download at 38.4Kbps.                    |
          |-----------------+------------------------------------------|
          |       **2       | Download at 57.6Kbps.                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       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=2     | Modem will operate in fax class II mode.   |
          |---------------+--------------------------------------------|
          |    #CLS=8     | Modem will operate in voice mode.          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       PROTOCOL/SPEED                       |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] Fn [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Selects the protocol and speed the modem    |
          |              | will attempt to connect at.                 |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      F0      | Auto-detect the highest common connect      |
          |              | speed.                                      |
          |--------------+---------------------------------------------|
          |      F1      | Select V.21 or Bell 103 at 300bps speed.    |
          |--------------+---------------------------------------------|
          |      F3      | Select V.23 at 75/1200bps speed.            |
          |--------------+---------------------------------------------|
          |      F4      | Select V.22 or Bell 212A at 1200bps speed.  |
          |--------------+---------------------------------------------|
          |      F5      | Select V.22bis at 2400bps speed.            |
          |--------------+---------------------------------------------|
          |      F6      | Select V.32 or V.32bis at 4800bps speed.    |
          |--------------+---------------------------------------------|
          |      F7      | Select V.32bis at 7200bps speed.            |
          |--------------+---------------------------------------------|
          |      F8      | Select V.32bis or V.32 at 9600bps speed.    |
          |--------------+---------------------------------------------|
          |      F9      | Select V.32bis at 12Kbps speed.             |
          |--------------+---------------------------------------------|
          |     F10      | Select V.32bis at 14.4Kbps speed.           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     REPORT INFORMATION                     |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] In [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Displays requested information about the    |
          |              | modem.                                      |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      I0      | Reports product identification code.        |
          |--------------+---------------------------------------------|
          |      I1      | Reports ROM checksum.                       |
          |--------------+---------------------------------------------|
          |      I2      | Tests and reports ROM checksum.             |
          |--------------+---------------------------------------------|
          |      I3      | Reports modem firmware version and          |
          |              | interface type.                             |
          |--------------+---------------------------------------------|
          |      I4      | Reports OEM response.                       |
          |--------------+---------------------------------------------|
          |      I5      | Reports country code.                       |
          |--------------+---------------------------------------------|
          |      I6      | Reports data pump model and revision.       |
          |--------------+---------------------------------------------|
          |      I7      | Reports DAA code.                           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     RPI CONFIGURATION                      |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] +Hn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Configures the Rockwell Protocol Interface. |
          |------------------------------------------------------------|
          |     Command     |                 Function                 |
          |-----------------+------------------------------------------|
          |       +H0       | RPI disabled.                            |
          |-----------------+------------------------------------------|
          |       +H1       | RPI enabled and local serial port speed  |
          |                 | set to 19.2Kbps.                         |
          |-----------------+------------------------------------------|
          |       +H2       | RPI enabled and local serial port speed  |
          |                 | set to 38.4Kbps.                         |
          |-----------------+------------------------------------------|
          |       +H3       | RPI enabled and local serial port speed  |
          |                 | set to 57.6Kbps.                         |
          |-----------------+------------------------------------------|
          |      +H11       | RPI+ enabled.                            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    SPEAKERPHONE OPTIONS                    |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] #SPK=x,y,z [cmds]                 |
          |--------------+---------------------------------------------|
          | Description: | Sets various options for speakerphone       |
          |              | functions.                                  |
          |------------------------------------------------------------|
          |    Command    |                  Function                  |
          |---------------+--------------------------------------------|
          |      x=0      | Microphone enabled.                        |
          |---------------+--------------------------------------------|
          |      x=1      | Microphone disabled.                       |
          |---------------+--------------------------------------------|
          |      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.             |
          |         |       |                                          |
          |         |   í 1 | DTMF tones are detected.                 |
          |------------------------------------------------------------|
          |      1      |  0 | V.25 1300Hz calling tone is not         |
          |             |    | detected.                               |
          |             |  í |                                         |
          |             |  1 | V.25 1300Hz calling tone is detected.   |
          |-------------+----+-----------------------------------------|
          |      2      |  0 | T.30 1100Hz fax tone is not detected.   |
          |             |    |                                         |
          |             |  í | T.30 1100Hz fax tone is detected.       |
          |             |  1 |                                         |
          |-------------+----+-----------------------------------------|
          |      3      |  0 | V.25/T.30 2100Hz answer tone is not     |
          |             |    | detected.                               |
          |             |  í |                                         |
          |             |  1 | V.25/T.30 2100Hz answer tone is         |
          |             |    | detected.                               |
          |-------------+----+-----------------------------------------|
          |      4      |  0 | Bell 2225Hz answer tone is not          |
          |             |    | detected.                               |
          |             |  í |                                         |
          |             |  1 | Bell 2225Hz answer tone is detected.    |
          |-------------+----+-----------------------------------------|
          |      5      |  0 | Call progress tones are not detected.   |
          |             |    |                                         |
          |             |  í | Call progress tones are detected.       |
          |             |  1 |                                         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               TONE GENERATOR - DIRECT ENTRY                |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] #VTS=[m, n, x]                    |
          |--------------+---------------------------------------------|
          | Range:       | m 200-3000, n 200-3000, 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.          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |             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.                                  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     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 DEVICE                        |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] #VLS=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Selects the I/O device for the DSP chip.    |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í #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=3    | External microphone only used for voice     |
          |              | I/O.                                        |
          |--------------+---------------------------------------------|
          |    #VLS=4    | Telephone line and handset used for voice   |
          |              | I/O; internal speaker enabled.              |
          |--------------+---------------------------------------------|
          |    #VLS=5    | Headset used for voice I/O.                 |
          |--------------+---------------------------------------------|
          |    #VLS=6    | Speakerphone used for voice I/O.            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                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 - LOCAL SERIAL PORT SPEED               |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] #BDR=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Sets the speed of the local serial port     |
          |              | when in voice mode.                         |
          |------------------------------------------------------------|
          |        Command        |              Function              |
          |-----------------------+------------------------------------|
          |        #BDR=1         | Set speed to 2400bps.              |
          |-----------------------+------------------------------------|
          |        #BDR=2         | Set speed to 4800bps.              |
          |-----------------------+------------------------------------|
          |        #BDR=4         | Set speed to 9600bps.              |
          |-----------------------+------------------------------------|
          |        #BDR=6         | Set speed to 14.4Kbps.             |
          |-----------------------+------------------------------------|
          |        #BDR=8         | Set speed to 19.2Kbps.             |
          |-----------------------+------------------------------------|
          |        #BDR=16        | Set speed to 38.4Kbps.             |
          |-----------------------+------------------------------------|
          |        #BDR=24        | Set speed to 57.6Kbps.             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 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:       | Unidentified                                |
          |--------------+---------------------------------------------|
          | Unit:        | Unidentified                                |
          |--------------+---------------------------------------------|
          | 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 SAMPLE QUALITY                    |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] #VBS=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Selects the number of bits per sample that  |
          |              | the modem records.                          |
          |------------------------------------------------------------|
          |    Command     |                 Function                  |
          |----------------+-------------------------------------------|
          |     #VBS=2     | Modem records 2 bits per sample in ADPCM  |
          |                | encoding.                                 |
          |----------------+-------------------------------------------|
          |     #VBS=3     | Modem records 3 bits per sample in ADPCM  |
          |                | encoding.                                 |
          |----------------+-------------------------------------------|
          |    í #VBS=4    | Modem records 4 bits per sample in ADPCM  |
          |                | encoding.                                 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    VOICE SAMPLING RATE                     |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] #VSR=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Sets the sampling rate used when recording  |
          |              | voice signals.                              |
          |------------------------------------------------------------|
          |    Command     |                 Function                  |
          |----------------+-------------------------------------------|
          |   #VSR=7200    | Selects a sampling rate of 7.2KHz.        |
          |----------------+-------------------------------------------|
          |   #VSR=11025   | Selects a sampling rate of 11.025KHz in   |
          |                | PCM encoding only.                        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                VOICE SILENCE DETECTION TIME                |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] #VSP=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Default:     | Unidentified                                |
          |--------------+---------------------------------------------|
          | 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.    |
          |----------------+-------------------------------------------|
          |     #VSS=2     | Standard silence detection sensitivity.   |
          |----------------+-------------------------------------------|
          |     #VSS=3     | Maximum silence detection sensitivity.    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     VOICE TIMING MARK                      |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] #VTM=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Configures timing mark placement.           |
          |------------------------------------------------------------|
          |       Command       |               Function               |
          |---------------------+--------------------------------------|
          |       #VTM=0        | Timing marks disabled.               |
          |---------------------+--------------------------------------|
          |       #VTM=1        | Timing marks enabled.                |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  VOICE TRANSMISSION LEVEL                  |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] #TL=hhhh [cmds]                   |
          |--------------+---------------------------------------------|
          | Default:     | 3FFF                                        |
          |--------------+---------------------------------------------|
          | Range:       | 0000 - 7FFF                                 |
          |--------------+---------------------------------------------|
          | Unit:        | Unidentified (hexadecimal)                  |
          |--------------+---------------------------------------------|
          | Description: | Sets the transmission level for sending     |
          |              | audio in voice mode.                        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       VOICE TRANSMIT                       |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] #VTX                              |
          |--------------+---------------------------------------------|
          | Description: | Commands the modem to begin transmitting    |
          |              | voice data.                                 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     VOICE VOLUME LEVEL                     |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] #VGT=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Sets the volume level when playing back     |
          |              | audio signals.                              |