The thing I was using in 1998 was a program Perry Lorier helped me with (and
by helped, I mean mostly wrote for me..) called vax, along with another
program vmcp which would send the AT commands to answer and which could just
as easily have dialled out too.
This doesn't do VoIP though, and the modem records in a format that I never
figured out how to play other than sending it back through the modem.
If you think this might be useful I can dig up the source code..
VAX(8)
NAME
vax - Vertical Access
SYNOPSIS
vax [mode] [exitstr] [file .. ]
DESCRIPTION
This program plays or records audio in 'raw modem' format,
and extracts 'DLE-shielded' codes (DTMF, busy, etc)
OPTIONS
mode
R - record: record to [file]
I - immediate: play from [file ..], exit right after
M - menu: play from [file ..], exit right after
P - prompt: play from [file ..], mute on non-exit
keypresses, exit after a short pause
Differences between modes are subtle, sometimes nonexistent. I
realised that the code could be less complex than it was. Eg menus
I can just play "$menu pause $menu pause.." to make them repeat
rather than it being part of vax.
Various debugging info is sent to stderr. There's no -v flag for
more verbose debugging. For less info use "2>/dev/null".
All DLE-escaped characters are sent to stdout, and to stderr in []'s
Normally used prompting for input (capture stdout, exit only on #)
but I also capture the numbers when recording (I could send them
via SMS, etc.. )
If a character is recieved that is in [exitstr], vax will exit()
with the position of the character in [exitstr]. After playing
the last file, vax will exit(0)
In prompt mode, any DTMF aborts playing, but does not exit unless
the character is also in [exitstr]. After a short pause without
any keypresses, the program exits. Not everyone knows to press #..
After 5 minutes of play/record, vax will exit(100). Normally, this
is a fatal error but when recording it might just be that the user
didn't stop talking for five solid minutes.. some people are like
that! On fatal errors, vax will fwrite(stderr) and exit(255).
EXIT STATUS
0 End of input file(s) reached, sent DLE-ETX and
recieved OK from the modem.
1-99 Recieved a DLE-escaped character contained in
exitstr, exit code indicates which character..
100 Timeout has expired.
255 Fatal error, description written to stderr.
ENVIROMENT VARABLES
PORT
the serial device that the modem is on, excluding /dev/
eg "ttyS0"
PLAY
command to put the modem in play mode ("AT#VPL\n")
REC
command to make a beep and begin recording ("AT#VBP#VRD\n")
ETX
the dle sequence to exit from play mode,
normally DLE-ETX ("\020\003")
CAN
the dle sequence to flush the modem's buffer
normally DLE-CAN ("\020\030")
LIB
Directory where recordings can be found when they're
not explicitly specified.
BUGS
none
UNINTENTIONAL OR UNDESIRABLE FEATURES
Various modems send "OK" or "CONNECT" or "VCON" in response to
modem commands. I should wait for the full string but the code
got too complex and wasn't working so now I just wait for 'O'
which should work fine for most modems. It doesn't seem to cause
any problems, so I don't see much reason to change it :)
To init the modem, answer the phone, etc, use vmcp or chat.
I really should write something myself to chat and configure
the comport but for now I'll recommend vmcp and linres, which do
an OK job.
Most modems default to using AD4 compression, and a comm speed
of 38400. I don't recommend trying to use any of the other modes
or speeds that your modem might claim to support. I tried and
couldn't get any of them to work.
Some modems (and commercial CIT cards) apparently operate more
like a soundcard in voice mode. This version of vax does not
support Vos Dialogic cards, soundcards, or modems that think
they are soundcards. If someone wants to give me a Dialogic
card I'll be happy to write support for it!
AUTHORS
Bruce Kingsbury (zcat)
Post by Peter LambrechtsenPost by David McNabHi folks,
I've got an old 56k external voice/fax/data modem, with RS232 serial
connection, phone/line jacks, and also 3.5mm audio in/out jacks on it.
Is it possible to use this modem to make outbound voice calls to the
POTS (regular copper-wire voice telephony) network?
If so, what software do I need?
I've downloaded/installed mgetty/vgetty, but the default install seems
to have no support for outbound voice calls.
What I want to do is have a mic headset plugged into the in/out jacks,
and to dial out and hang up via software.
If you are looking to do VoIP or similar telephony through your modem you
won't have any success. If you wanted to run Asterisk then you would need a
X100P or similar FXO PCI card off trademe.
That would allow you to run a Softphone on your PC and plus the headset into
the sound card on your PC. And then dial out via the card to the POTS
network.
The other option if you are wanting to do what you are talking about is to
install "minicom" which lets you do a "at" dial commands in a text window.
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