Sd Card Usage - Vidicode V-Tap Manual

6 SD card usage

The SD card is used to store the recorded calls. Without an SD card the
recording of calls does not work. The V-Tap system stores the recorded
data as a WAV file per call in the G.711 A-Law format. This takes 8000
bytes per second of storage space. The SD card must be FAT32 formatted
and can be seen as a big cyclic memory buffer, because the oldest file is
deleted automatically when the card is getting full.
The file names on the card are like "00000001.WAV", "00000002.WAV",
etc. No call data can be extracted from the name, only the date and time
of creation can be read from the directory list. The actual call data with
phone number is enclosed inside the WAV header of each file and can
be extracted by the Apresa or V-Archive software on the PC.
The WAV files are optionally encrypted, in which case they cannot be
played directly by any media player (only noise is heard then).
In case of using a Tunnel server, the files are sent to the server as soon as
they are closed. So, data is not sent live to the server, but only after the
call has ended or after a file has reached its maximum size.
In the case that no Tunnel server is used, the files are just stored on the
card until the user gets the card out. SD cards with recorded files on
them can be read and interpreted by the V-Archive software on the PC.
Files are not deleted from the card by the system. Files are written until
the card is full (error situation) or until the maximum number of files has
been reached, in which case the oldest files are overwritten.
Another function for the SD card is to define a fixed IP address for the
V-Tap; see IP address. Yet another function is to
Formatting an SD card is possible in two ways; see
Safely removal of the SD Card and Power Off.
. Press the button for 2 seconds (Amber & Blue LED OFF).
. Release the button (Amber LED flashing).
. Take out the SD card or the USB cable (power off).
NOTE:
The procedure above does not work when start/stop with the button is
set (see Button Mode). In that case, the SD card can just be taken out.
V-Tap Analog 2 Manual EN v4.21 Sept 2021 © 2018-2021 Vidicode
update the firmware.
Format SD card.
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