Re: [TECH] Modem-to-Modem wire connection

From: Miguel Angel (
Date: Wed Apr 26 2000 - 17:25:23 CEST

On Wed, 26 Apr 2000, Michele Andreoli <> kindly wrote:
> On Tue, Apr 25, 2000 at 11:04:26PM +0200, Miguel Angel nicely wrote:
> > > The problem are daemon: no success with daemons on the modem port,
> > > neither mgetty, neither agetty, a this moment. I need to tell this
> > > daemon to answer (ATA) without rings, etc.
> > >
> >
> > May be a little electric circuit to inject an alternal voltage in the modem
> > cable when pressing a button could simulate the ring call.
> > The circuit can be as simple as a transformer and a button.
> > Somebody remembers the phone line ring voltage?
> >
> If miterm work fine, better thing is to patch "agetty", constrain it
> to send an ATA command if activity detected on the line.

You have no mean to detect any activity on the line (but listening
yourself to the phone speaker) since the modem will not be on line till an ATA
is sent. The only way a hangup modem has to detect line activity is a RING
detection (well, this is not entirely true to a modem with voice support)
May be what you want is "agetty" to send an ATA at startup and after receiving
a HANGUP signal? (anyway i still think it is more fun doing a hardware emulator)


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