[PLUG] OT: VoiceSpamAssassin
John Todd
jtodd at loligo.com
Fri Jun 27 10:01:01 UTC 2003
>The federal government has opened its national Do-Not-Call registry:
>
>* http://donotcall.gov (I couldn't get through this morning)
>* (888) 382-1222
>
>c|net has a write up:
>
> http://news.com.com/2100-1037_3-1021645.html?tag=fd_top
>
>--Paul Heinlein <heinlein at attbi.com>
A better solution to phone spam is Asterisk, with it's included
Zapateller and PrivacyManager modules.
Short description: Asterisk (http://www.asterisk.org/) is an OSS PBX
system which can be easily turned into a voicemail and VoIP gateway
for your house. With the addition of a $100 card, it can take your
house line into the back of your Linux box and pre-parse your calls.
Then, upon completion of checking your calls, it will forward the
call to either a SIP device (like a Cisco ATA-186, with two lines at
~$130) or to any other gateway of your choice.
If your caller does not have caller ID, the Zapateller application
plays the first three tones of a "number out of order" recording,
which most automated phone bots will take as a "bad number" and they
will remove you from their database and hang up at the same time.
This gets about 50% of the phone spam that I see.
The PrivacyManager application next looks for any inbound calls
without caller ID. It forces the caller to enter in a valid caller
ID through the touch-tone pad. Most telemarketers will not do this
(none, actually, in my experience) and they hang up. Since
implementing Asterisk, I have had two spam calls get through (six
months.)
You can get more sophisticated than that if you want: blacklists,
whitelists, pre-announcements on _all_ calls, database lookups. It's
all possible.
JT
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