[asterisk-users] For all your office needs... and voip-greylisting

[Jay Milk]

Hello all,

not sure this belongs here, but I'm wondering if anyone else has 
received "phone spam" lately.  Over the last eight weeks, I've received 
over 60 calls to my toll-free numbers, originating from various fake 
numbers in the 940 and 956 area codes.  When I still *listened* to them, 
they began with "for all your office needs go to smtmco.com."

Whenever I call the numbers back (based on caller id), I get one or two 
rings, then a click, then dead air.  That's also the reason I'm posting 
this here -- these folks either have access to a large pool of numbers, 
or to a list of "dead" numbers.  The last six numbers (three today) are:
940.387.0483
956.982.1640
940.891.6197
956.554.7617
940.891.6099
956.421.3378

The 956 numbers are all SWBell exchanges, while the 940s are GTE/Verizon 
exchanges.  All calls came in through my toll-free numbers (which in 
turn are hosted by vitelity/exgn). 

The website referenced isn't loading, but registered to:

Registrant:
   Sales Team
   321 High School Rd NE, PMB 348
   Suite D3
   Bainbridge Island, Washington 98110
   United States
  (800) 921-0136  ;  NS1.ORDERSHOPPER.COM

Ordershopper.com also seems a dead-end, as it's registered "by proxy", 
as all good spammers do.

I have since established a greylisting function, which simply does the 
zapateller and then prompts the caller to call back within ten minutes 
to be put through.  If the same caller (by ID) calls the same number 
within those 10 minutes, he's put through to a person and whitelisted.  
If the caller hangs up before hearing the message (during the SIT tone), 
the numbers is marked for blacklisting.  Outgoing calls are 
automatically whitelisted, as are certain (local) area codes.  This has 
kept the phone silent for a couple of weeks, and afaik, no valid calls 
were killed.

But the real question is -- has anyone else seen this?