A few things that the scammers are also doing, is getting in to weak exposed ata's ( see http://www.shodanhq.com/ ) or using other methods of hijacking subscriber credential's, then dialing area codes 809, 284, or 876 which have hefty LD charges which the end carrier gets from AT&T or Cable & Wireless. They dial a destination VM and continually do 3 minute calls and rack up the charges.
I've also noticed that the sipvicious scans have dramatically increased in search of easy credential access. A fun world we live in. Mike Mike Ashton CTO Quality Track International Phone: +1 647.724.3500 x251 Cell: +1 416.527.4995 On Sun, Apr 20, 2014 at 10:13 PM, Alex Kink <[email protected]> wrote: > I experienced the same problem over the last few months. There would be > calls from spoofed numbers that would call the toll-free number and just > hang there for multiple hours. When I got around to fixing the problem it > had cost me about $100 between 4 separate calls. > > What was happening is the call would end up in a VM and just sit there > silently. Since most VMs are very short anyway, I limited the maximum > length to 3minutes and that solved the problem. > > > On Apr 20, 2014, at 17:44, Matthew Gamble <[email protected]> wrote: > > > > It also could be someone targeting voicemail systems for attack and using > > the toll free number to access the PBX. That's quite common. > >> On Apr 20, 2014 5:07 PM, "Philip Mullis" <[email protected]> wrote: > >> > >> 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] > >
