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Date:      Tue, 8 Jan 2002 16:42:27 GMT
From:      "Julian Stacey" <jhs@bim.bsn.com>
To:        isdn@freebsd.org
Subject:   line induction observed by i4b ?
Message-ID:  <200201081642.g08GgRP47628@jhs.muc.de>

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I wonder if I'm getting induction on my isdn line ? The Tengleman
shop under me shares same cellar & cable runs I believe, & my log
shows this:

isdnd.log:05.01.2002 13:50:43 CHD 00199 Call from NotAvailable to 23269369
isdnd.log:05.01.2002 13:50:47 CHD 00200 Call from NotAvailable to 23269369
isdnd.log:08.01.2002 15:57:30 CHD 00218 Call from "TW Tengelmann" to 23269369
isdnd.log:08.01.2002 15:57:34 CHD 00219 Call from "TW Tengelmann" to 23269369
isdnd.log:08.01.2002 15:57:54 CHD 00220 Call from "TW Tengelmann" to 23269369
isdnd.log:08.01.2002 15:57:58 CHD 00221 Call from "TW Tengelmann" to 23269369

I had a word with the manageress of Tengelmann just after the last event,
& she said yes she or someone had been phoning from 26022660
(which is aliased to TW Tengelmann in my alias file).
+49.89.23269369 answerphone announces as "something & Thomas Lange"
She said she knows that number too !

We are both puzzled ! I'm intrigued, All I can think of is :
	- line induction from paralle cables
	- I've registered for DSL, maybe D.Telekom have changed my
	  line impedance at the exchange end (& as I live in middle
	  of city, it'll be a short cable, so inpedance my end will
	  have changed too.  ( I got an envelope today with T-Online
	  software (that I presume & hope will be fully irrelevant
	  under Unix) so they're getting ready to switch my line
	  I guess, though I haven't received a splitter yet.)

I've also wondered what the security is on ISDN lines. On analogue,
people sometimes break into cellars, put an active switcher on
cable, & make calls at neighbours expense for years before if ever
anyone has a clue, What's the feasability for ISDN ?   & DSL ?
How safe are we ?  OK, I dont expect Tengelman (a big food chain in
Germany) is up to tricks, but there's something strange happening
& it reminds me about those cables in the common cellar area of
this big building.

Julian
J.Stacey	Munich Unix (FreeBSD, Linux etc) Independent Consultant
 Free Software with Free Sources:	http://bim.bsn.com/~jhs/free/
 Ihr Rauchen = mein allergischer Kopfschmerz !  Schnupftabak probieren !

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