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- Path: darkstar.prodigy.com!davidsen
- From: davidsen@tmr.com (bill davidsen)
- Newsgroups: comp.dcom.modems
- Subject: Re: USR Courier and dialback
- Date: 24 Jan 1996 00:08:55 GMT
- Organization: TMR Associates, Schenectady NY
- Distribution: World
- Message-ID: <4e3tan$2690@usenetw1.news.prodigy.com>
- References: <4diofl$gm1@ccuh.wlv.ac.uk> <31005c52.8887969@news.insync.net>
- NNTP-Posting-Host: darkstar.prodigy.com
- Originator: davidsen@darkstar.prodigy.com
-
- In article <31005c52.8887969@news.insync.net>,
- Bill Garfield <bubba@insync.net> wrote:
-
- | The purpose in the delay is in fraud prevention. With some telephone
- | switching machines you can call a dialback modem and allow the modem to
- | hangup first while you hold the line open, waiting for the modem to go
- | offhook to place the dialback.
-
- For people who want something more secure, get the dialing feature
- which allows you to flash the switchhook and make a call while
- connected. Then add flash to your dialing sequence. The dialtone you
- get after the flash is not associated with the original incoming
- call, nor with any incoming number, and therefore can not be
- spoofed.
-
- The only problem is that you can dial back so fast that the other
- modem hasn't quite hung up yet, which does take a small wait. Found
- this out the hard way when someone reported "all busy" after a telco
- "upgrade."
- --
- Bill Davidsen (davidsen@tmr.com)
- Davidsen's first rule of system administration:
- He learns to swim fastest who is thrown in the deepest water.
-
-