04-15-2014
Thank you Corona for your reply,
I have extracted some calls using the original software but it was a very long job. I cannot extract more than one call per time. Given the fact that the tape contains 10000 calls it is very slow.
The program I use is a proprietary backup tool, however, it uses common compression format: PCM and ADPCM. The tape stores calls grouped by recording channel. Each tape records 128 channels
Using the dd command I copied just 165 MB of data despite the fact the tape is 20 GB. Why? I think it is because it reads the first channel and than stops. 165Mb x 128 channels = (21120) the tape is dds4 20 gb so this should be the reason.
This is the command:
dd if=/dev/nst0 bs=32K of=output_file
How can I open the data extracted with the dd or other commands? If this info is not enough, what should I look at to decrypt the data?
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LEARN ABOUT CENTOS
autovbox
autovbox(1) Linux System Administration autovbox(1)
NAME
autovbox - ISDN voice box (sound converter)
SYNOPSIS
autovbox [-2 | -3 | -4 | -h | -v] [-n name] [-p phone] [-l location]
DESCRIPTION
Convert .au files (Sun audio format) on standard input into vbox files (vbox audio header) on standard output. autovbox is a link to vboxc-
nvt(1).
OPTIONS
Autovbox reads from stdin and writes to stdout.
-2, --adpcm-2
Convert to ADPCM 2 format.
-3, --adpcm-3
Convert to ADPCM 3 format.
-4, --adpcm-4
Convert to ADPCM 4 format.
-u, --ulaw
Convert to ulaw format (default).
-n NAME, --name NAME
Name to write into the header.
-p, --phone PHONE
Telephone number to write into the header.
-l LOCATION, --location LOCATION
City to write into the header.
-h, --help
Show summary of options.
-v, --version
Show version of program.
SEE ALSO
rmdtovbox(1), vboxtoau(1), vboxmode(1), vboxcnvt(1), vbox(5).
AUTHOR
This manual page was written by Andreas Jellinghaus <aj@dungeon.inka.de>, for Debian GNU/Linux and isdn4linux.
Now maintained by Paul Slootman <paul@debian.org>.
ISDN 4 Linux 3.13 2002/10/15 autovbox(1)