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MultiModemDSVD User Guide
Voice Operation
Operation in DSVD mode enables data transfer and voice conversation to occur
simultaneously during a data connection. On a DSVD call, an ordinary telephone
connected to the modem is used as the voice interface. Both local and remote mo-
dems must have compatible DSVD technology to support the DSVD function.
To use DSVD, you must first establish a V.34/V.42 data connection between compat-
ible DSVD modems. Once the connection is established, all that is needed to initiate
a conversation is for either party to pick up the phone. The caller hears a ring over
the phone, just like an ordinary call. On the other end, the modem makes a ringing
sound through its onboard speaker. If the phone at that end is not picked up, even-
tually the caller hears a busy signal. When the modem is turned on but not in DSVD
mode, the phone can be used to make ordinary phone calls.
You can control DSVD either by running a communication program that supports
DSVD, such as the program included with the modem, or by manually issuing AT
commands to the modem as described in the following sections.
To Turn On DSVD Mode
1. In the terminal window of your communication application, type AT and press
2. Type AT-SMS=1 and press ENTER to turn on DSVD mode, or type AT-SMS=3
To Turn Off DSVD Mode
1. In the terminal window of your communication application, type AT and press
2. Type AT-SMS=0 and press ENTER to turn off DSVD mode.
To Originate a DSVD Call
1. In the terminal window of your communication application, type AT and press
2. Type AT&F and press ENTER to reset the modem to its default configuration.
3. To dial, type ATDTnnnnnnn and press ENTER, where nnnnnnn is the phone
4. When you see a CONNECT response on your terminal, you can pick up the
5. To hang up, type +++ATH and press ENTER.
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ENTER. The modem responds OK.
and press ENTER to turn on automatic mode select.
ENTER. The modem responds OK.
ENTER. The modem responds OK.
This action ensures that the modem is in automatic DSVD mode.
number of a remote DSVD modem.
phone and talk to the remote user while simultaneously sending data to the re-
mote modem.
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