nanog mailing list archives
Re: TTY phone fraud and abuse
From: Suresh Ramasubramanian <suresh () outblaze com>
Date: Mon, 12 Apr 2004 07:18:51 +0530
[4/12/2004 4:49 AM] Steven M. Bellovin :
Naturally, miscreants (to use robt's terminology) try to find ways to make such calls from the U.S. more cheaply. Sometimes, this involves hacking PBXs, other times, it involves subscription fraud, or a variety of other kinds of misbehavior. The responses are similar to those we use on the Internet -- traffic analysis (similar to looking at NetFlow), blacklisting calls to certain countries from, say, pay phones, etc.
There is another class of people who route calls out from the USA to India (or elsewhere) using VOIP, terminate the calls at an unauthorized (that is, not run by a licensed telco) exchange in india, and then route the calls out through the local pstn or mobile network.
Quite a few of the "call $asian_country for cheap" phone cards you find at ethnic grocery stores seem to work on these lines.
The local telco doesn't see a red cent of any settlement charges when this happens. Local telcos are, of course, all against this, and use any and every excuse to get these exchanges busted - a procedure that typically involves having the local police raid the exchange.
srs -- srs (postmaster|suresh)@outblaze.com // gpg : EDEDEFB9 manager, outblaze.com security and antispam operations
Current thread:
- Re: Lazy network operators, (continued)
- Re: Lazy network operators jlewis (Apr 10)
- Re: Lazy network operators Suresh Ramasubramanian (Apr 10)
- Re: Lazy network operators Sean Donelan (Apr 10)
- Re: Lazy network operators Dan Hollis (Apr 10)
- Re: Lazy network operators Jeff Workman (Apr 10)
- Re: Lazy network operators Scott Call (Apr 10)
- TTY phone fraud and abuse Sean Donelan (Apr 10)
- Re: TTY phone fraud and abuse Scott Call (Apr 10)
- Re: TTY phone fraud and abuse Sean Donelan (Apr 11)
- Re: TTY phone fraud and abuse Steven M. Bellovin (Apr 11)
- Re: TTY phone fraud and abuse Suresh Ramasubramanian (Apr 11)
- Re: TTY phone fraud and abuse Steven M. Bellovin (Apr 11)
- Re: TTY phone fraud and abuse Stephen Sprunk (Apr 11)
- Re: TTY phone fraud and abuse Iljitsch van Beijnum (Apr 12)
- Re: TTY phone fraud and abuse Suresh Ramasubramanian (Apr 12)
- Re: TTY phone fraud and abuse Niels Bakker (Apr 12)
- Re: TTY phone fraud and abuse Patrick W . Gilmore (Apr 14)
- Re: Lazy network operators Sean Donelan (Apr 10)
- Re: TTY phone fraud and abuse Patrick W . Gilmore (Apr 14)
- Re: TTY phone fraud and abuse Laurence F. Sheldon, Jr. (Apr 15)
- Re: Lazy network operators Paul Vixie (Apr 11)
- abuse standards & consumer reports William Allen Simpson (Apr 11)