Hi, Thanks Ivan. But what is "clear CIC"?
Yajie Sent from my iPhone > On 2014年4月20日, at 下午8:51, Ivan Kovacevic <[email protected]> > wrote: > > We had something similar a few months ago. One of our clients' > disconnected TFNs started getting upwards of 30,000 calls per hour. > > Didn't bother us too much, but the upstream carrier got a little flustered > by so many non-connected calls. We are the RespOrg for the number so we > cleared the CICs in SMS/800 and got the spam calls to stop. > > Calls were not connecting so I don't know what the attacker was trying to > accomplish, but there was no way to stop/block the calls other than clear > the CICs. The ANIs were spoofed... our client was lucky the number was not > active so we could clear the CICs. If the number was active, I am not sure > what they/we would've done. > > As Philip said - the competitors and the carrier benefit in this scenario. > > > Since the cost of committing the crime is so low and it's easy to spoof > ANIs, it's difficult to preclude this type of attack. The upstream carrier > has involved their fraud department, and theoretically they should be able > to trace where the calls came from, but I am not holding my breath. > > Best Regards, > > Ivan Kovacevic > Star Telecom | www.startelecom.ca | SIP Based Services for Contact Centers > > > -----Original Message----- > From: Philip Mullis [mailto:[email protected]] > Sent: Sunday, April 20, 2014 5:07 PM > To: Bruce N > Cc: asterisk Mailing > Subject: Re: [on-asterisk] Toll-free attacks? > > The provider benefits from these type of attacks. > Also competitors of a target company have also known to take joy in > racking up a competitors bill. > > If you finding there from a consistent set of numbers or anonymous filter > or drop accordingly. > >> On Apr 20, 2014 4:44 PM, "Bruce N" <[email protected]> wrote: >> >> Happy Easter / Spring to ya'll. >> >> Has anyone seen a drastic increase on their toll-free inbound calls >> which results in high charges from provider? >> >> Is this a new type of attack? Who might benefit from this type of >> attack and how to mitigate it? >> >> - Bruce > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
