Problem with I-modem

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Hi,

On Sat, Nov 14, 1998 at 02:01:24PM +0200, Mikael Jokela wrote:
> > I did not hear any negative reports recently, and since "modem dialup" is
> > mostly my responsibility, I assume that this means "this problem didn't
> > happen".
> 
> I'm getting maximum of 10 calls a day. As long as the I-modem
> works (might be a couple of days) it works fine. But when the 
> problem arises it always reports busy until I command atz! 
> (which is hardware reset).

Doesn't sound sane.

> > Which firmware version is that? To what kind of ISDN line is it
> > connected? In-house PABXs tend to be "strange" in kind of ISDN
> > protocols, and some of them are pretty unreliable sometimes.
> 
> I don't know technical things about ISDN, but it is a standarnd
> ISDN terminal device with 2 B-channels, which is widely used in 
> Finland. It is a white box which is connected by telephone line 
> to the phone company. 

Good - not a PABX problem then.  Maybe a problem with the local Telco?  I
don't know anything about ISDN in finland.

> The ISDN D-channel protocol is also a 
> standard one. It might be different from the protocol which is 
> used in Germany.

No idea...

[ ati7 output ]
> Supervisor rev         2.2.2
> DSP rev                2.2.2

I think that's actually latest official firmware version.  Beta test is
at 2.4.5, but I may not release those files - maybe contact your USR
distributor wether they can get you 2.4.5 for beta testing.

[..]
> > I have seen such reports on this list.  It seems to mean "some other
> > device on the same ISDN bus took the call, and the I-Modem did not
> > realize" (which would mean "ISDN D-Channel protocol bug").
> 
> I have three other devices but two of them are analog so 
> I don't think they cause trouble. (Anyway, they are connected
> to the ISDN terminal box.) But then I have a Teles passive ISDN 
> card which is used by BBBS software. But in /var/log/messages 
> I can see all incoming calls and which calls are answered by 
> this device and which not. When a call comes to the number where 
> the I-modem is, the Teles ISDN card always just ignores it, 
> according to this log file.

What does the Teles log show when the I-Modem "stops working"?

> Of course, I could try detaching the Teles card from the bus 
> but it would block BBBS's ISDN calls.
> 
> But because atz! seems to always solve the problem, I still
> think the problem is in Courier.

atz! might reset something on the S0 bus (new TEI negotiation etc.), so
it might be a different device.  Try removing the Teles card when the
I-Modem hangs, and see whether it changes anything...

gert
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Gert Doering - Munich, Germany                             gert@greenie.muc.de
fax: +49-89-35655025                        gert.doering@physik.tu-muenchen.de