2 Aug
2005
2 Aug
'05
8:34 a.m.
Here's a new direction for that analog modem question... it's sort of getting
creative in some interesting directions, but not quite what
I have a system with 5 internal modems - I can't go with serial
ports/external modems for this system, they must stay internal. So, I need
to find a way so people can telnet to them. Essentially, I have a lan
connection and a bank of analog modems - Can anyone think of a solution, no
matter how crazy it is, to get me to be able to telnet from the internet and
connect to these 5 systems?
If I get 5 phone lines, that's not doing me any good, as I want to make it
accessible over the net. So, somehow I have to get a connection to go from
the net to trigger an analog modem source, which calls one of the 5 internal
modems, then feeds the data back over the line and to the telnet connection.
I've been researching some of the solutions people have proposed, but I'm not
real familiar with some of the capabilities of these systems. With the
reverse telnet concept, that would work if I could change my computer's modem
pool to external serial devices (get rid of the analog). I can't do that
yet..
Perhaps is there a device that acts as a remote access server, that once
connected, it dials out through another port to make a connection? Or, was
there a LAN device that would allow you to telnet to the device and initiate
a call over an analog phone line?
Pete
2 Aug
2 Aug
7:49 a.m.
On Tue, 2 Aug 2005, Pete Bartusek wrote:
I have a system with 5 internal modems - I can't
go with serial
ports/external modems for this system, they must stay internal. So, I need
Ok, first of all, what is this "system"? I presume it is something you
can't add an ethernet card to?
to find a way so people can telnet to them.
Essentially, I have a lan
connection and a bank of analog modems - Can anyone think of a solution, no
matter how crazy it is, to get me to be able to telnet from the internet and
connect to these 5 systems?
1. Get hardware and software
2. ???
3. Profit!
Perhaps is there a device that acts as a remote access
server, that once
connected, it dials out through another port to make a connection? Or, was
there a LAN device that would allow you to telnet to the device and initiate
a call over an analog phone line?
If you build it, they will come.
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
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8:14 a.m.
Pete Bartusek wrote:
Here's a new direction for that analog modem
question... it's sort of getting
creative in some interesting directions, but not quite what
Perhaps is there a device that acts as a remote access
server, that once
connected, it dials out through another port to make a connection? Or, was
there a LAN device that would allow you to telnet to the device and initiate
a call over an analog phone line?
From the Portmaster FAQ:
http://www.portmasters.com/faq.html#dialoutip
The problem remains that a direct modem-modem connection won't work
unless there's local interaction at both ends to open the line.
You might also wish to look at the Asterisk project:
http://www.asterisk.org
OpenSource PBX software for Linux systems.
Doc
8:41 a.m.
On Tue, 2 Aug 2005, Doc Shipley wrote:
You might also wish to look at the Asterisk
project:
http://www.asterisk.org
OpenSource PBX software for Linux systems.
Asterisk would be a great solution as well but the boards required to make
it work might be more expensive than a cheap PBX. You'd need to use telco
boards that could implement modem tones on their ports, which are
available but pricey.
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
9:09 a.m.
Vintage Computer Festival wrote:
On Tue, 2 Aug 2005, Doc Shipley wrote:
If you google around, or just check out their mailing lists, there
are some pretty cheap options.
I still think you're right - a small used PBX system is probably the
cheapest solution.
Doc
You might also wish to look at the Asterisk
project:
http://www.asterisk.org
OpenSource PBX software for Linux systems.
Asterisk would be a great solution as well but the boards required to make
it work might be more expensive than a cheap PBX. You'd need to use telco
boards that could implement modem tones on their ports, which are
available but pricey. 
11:57 a.m.
On Tue, 2 Aug 2005 10:34:17 -0500
"Pete Bartusek" <pbmain at wideopenwest.com> wrote:
With the reverse telnet concept, that would work if I
could change my
computer's modem pool to external serial devices (get rid of the
analog). I can't do that yet..
Get a terminal server with "reverse
telnet" capability that rises DTR on
the serial port if someone telnets to the corresponding TCP port. [1]
Get modems with "dial on DTR" function and connect them to the serial
ports of the terminal server. E.g. my old US Robotics Courier can do
this.
Get an old analog PBX. Connect your BBS system and the modems hanging
from the terminal server to it.
Programm terminal server and modems, setup PBX.
Done.
If someone opens a telnet session to a port of the terminal server the
modem "dial out" is triggered by the DTR signal. The modem dials the
number stored in its NVRAM. The PBX connects the modem to a line of your
BBS system. The BBS systems gets an incomming call... CONNECT! :-)
[1] My terminal server does this. I use the DTR signals to control solid
state relais. That way I can remote power cycle the machine thats
console is connected to the corresponding serial port.
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
1:13 p.m.
I don't recall an explanation of WHY you want to do it, nor WHY the modems
MUST be internal, etc.
But it sounds like what you are looking for could be easily accomplished
with another PC., and some minor programming.
The added PC could have an internet connection, and a handful of modems
(internal OR external). It could then connect to the internal modems on
your PC.
11:02 p.m.
as folks have stated,
you'll need analog modems to talk to your analog modems,
and you'll probably want a phone switch (PBX) to go between.
I'm assuming that you have an existing box that does something you
want, say an old BBS system, and over which you do not have full
hardware and software control.
I BBS Box w/internal modems
|
II |(x5 phone cord)
|
III phone switch (PBX)
|
IV |(x5 phone cord)
|
V modems (x5)
|
VI |(x5 serial cable)
|
VII terminal server
|
VIII |(ethernet)
Perhaps is there a device that acts as a remote access
server, that once
connected, it dials out through another port to make a connection? Or, was
there a LAN device that would allow you to telnet to the device and initiate
a call over an analog phone line?
I am fairly certain that some terminal servers can do this out of the
box. If not, it would not be difficult to make a linux box to do this
and occupy the "terminal server" slot (VII) in the above diagram.
Some terminal servers, or the "terminal server" linux box, can make
use of internal modems, which might make for a neater installation,
because you would have V, VI, and VII in one box.
As someone mentioned, newer modem bank/terminal servers used by ISPs
and others with large dialin (or dialout) pools are all-digital units
in which the modems themselves are software and DSPs and the units
attach to the phone system via a T-1 or other high-capacity digital
phone circuit; in the above diagram, that would mean that V, VI, and VII
are one (multi-thousand dollar) box, and IV is a T-1 interconnect (a pair
of T-1 CSU/DSU's crossover cabled to each other) or similar instead
of a bunch of serial cables.
If you have just the right modems and software on the system involved,
you could eliminate the PBX. Some modems have direct-wire capability
for bare copper wires, plus Tony Duell's post stated that some modems
do not need the voltage provided by the phone switch in order to
function properly.
As many folks have pointed out, if you can alter the hardware picture,
you can eliminate more boxes. Keep in mind that if your "BBS Box" is
standard PC hardware, modem cards could be removed and replaced by
serial cards one at a time. If you can't alter the software on the
"BBS Box" and it is expecting modem feedback, you can probably rig the
terminal server to issue whatever the sw needs as part of the connect
script ("RING RING CONNECTED").
As people have mentioned, many companies have made various test boxes
which might be thought of as PBX's with just one or two lines.
A one-box solution is certainly technically feasible, but I've never
seen one; I expect there's never been much market for one.
Old PBX's, terminal servers, and modem banks can all be cheap to free.
Usually the bigger and heavier, the cheaper they are :)
--akb
7081
days inactive
7082
days old
7 comments
6 participants
participants (6)
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