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VoiceView is a feature that allows for Switched Voice and Data (SVD) transmissions. This means that your modem can send voice and data at the same time over a telephone line on a single connection. VoiceView alternates (switches) the voice and data signals, which makes it different from DSVD, which allows for simultaneous transmission of voice and data signals.

The following table lists the VoiceView AT commands that your modem understands. Each command description names the command, explains it, and lists any associated parameters.

VOICEVIEW COMMANDS
Command Description
+FCLASS=80 Enter Voice Mode. AT+FCLASS=80 instructs the modem to enter VoiceView mode and use the set of VoiceView mode commands.
-SVV Start VoiceView Data Mode. AT-SVV initiates the transmission of the VoiceView data mode start sequence and initiates a data transaction.
-SAC Accept Data Mode Request. AT-SAC instructs the modem to accept the incoming VoiceView data mode start sequence and proceed with establishing a data transaction.
-SIPn Initialize VoiceView Parameters. AT-SIPn sets VoiceView parameters.

Parameters: n = 0 - 2

n = 0 Reset parameters to defaults

n = 1 Reset parameters to defaults and audit message storage

n = 2 Reset parameters to defaults and erase message storage

-SIC Reset Capabilities Data to Default Setting. AT-SIC resets the capabilities data structure to the default capabilities.
-SSQ Start Capabilities Query. AT-SSQ initiates the transmission of the VoiceView capabilities.
-SDA Start Modem Data Mode. AT-SDA initiates the transmission of the modem data mode start sequence and causes the modem to switch to data mode.
-SFX Start Facsimile Data Mode. AT-SFX initiates the transmission of the fax data mode start sequence and causes the modem to switch to fax data mode.
-SMTn Telephone Handset Mute Control. AT-SMTn controls the manual muting of the local telephone interface.

Parameters: n = 0, 1

n = 0 Unmute (default)

n = 1 Mute

-SQR=n Capabilities Query Response Control. AT-SQR=n controls the response to a capabilities query.

Parameters: n = 0, 1

n = 0 One-way response. Your modem does not request capability information from the originating modem.

n = 1 Two-way response. After answering a query for its capabilities, your modem requests capability information from the originating modem.

-SCD=n Set Capabilities Data. AT-SCD=n is used to read, add to, or establish the contents of the modem's capabilities data structure. The capabilities elements (n) consist of pairs of hexadecimal numbers and specify the capabilities information.

AT-SCD? Reads the current capabilities

-SER? Error Reporting. AT-SER? asks the modem for an error report. The modem responds with either 0 (no error found) or a pair of hexadecimal digits representing the error parameter byte. These error codes are listed in the Error Reporting Codes table.
-SSP=<compound value> Set VoiceView Transmission Speeds. AT-SSP=<compound value> specifies the data modulation schemes that are associated with the VoiceView mode tones. The digits of the compound value represent burst speed, recovery speed, and priority speed.

Valid values: 0 - 7

0 V.21 300 bps FSK

1 V.27ter 4800 bps DPSK

2 V.29 9600 bps QAM

3 V.29 4800 bps QAM

4 V. 17 7200 bps TCM

5 V.17 9600 bps TCM

6 V.17 12000 bps TCM

7 V.17 14400 bps TCM

Default: (0, 1, 2)

-SSR=n Start Sequence Response Control. AT-SSR=n enables or disables a response to all VoiceView data start sequences.

Parameters: n = 0, 1

n = 0 Disable response

n = 1 Enable response (default)

+FLO=n Flow Control. AT+FLO=n allows the computer to identify and select the type(s) of flow control provided and used.

Parameters: 0, 1, 2

n = 0 No flow control

n = 1 Bidirectional XON/XOFF flow control (default)

n = 2 ITU circuit 133 for flow control of the modem by the computer; circuit 106 for flow control of the computer by the modem

The following table lists the error codes reported in response to the AT-SER? command. When this command is used to ask the modem for an error report, the modem responds with either 0 (no error found) or a pair of hexadecimal digits representing the error parameter byte. These error codes, along with their explanations, are listed in the following table.

Error Reporting Codes
Error Code Description
81 Unrecognized command issued by the computer
82 Unsupported parameter received
83 Could not initiate data mode because switchhook is on-hook
84 Invalid capabilities information written by the computer
85 Could not initiate capabilities query
86 No data available to send to the computer
87 Could not initiate data mode because the message storage system is receiving messages
88 No incoming start sequence present
89 Could not initiate data mode because capability not active
41 Send sequence error
42 Receive sequence error
43 Unexpected DISC received as response
44 Maximum number of retransmissions (N200) exceeded
45 Maximum number of octets in I-frame exceeds N201
46 Maximum number of outstanding I-frames (k) exceeded
21 Timeout waiting for a valid mode tone in the start sequence
22 Timeout waiting for data modulation to begin after the start sequence
23 Timeout waiting for a valid data frame or near-end has no remove flow control (T203 expired)
24 Inactivity timeout in VoiceView auto-answer state (T300 expired)
25 Timeout waiting for a response to a capabilities query (T301)
26 Timeout waiting for a response to a capabilities exchange request (T301)
27 Timeout waiting for the remote modem to respond to a data mode start sequence (T200 expired)
28 Timeout waiting for the remote modem to remove flow control
29 Timeout waiting for data from the computer (T303)
2A Timeout waiting for physical layer to transmit frame
2B Timeout waiting for a response from the computer after sending an event indication (T310)

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