On 1/7/2016 1:53 PM, Mark Lloyd wrote:
On 01/07/2016 12:38 PM, Gordon Shumway wrote:

[snip]

Nomorobo explains how their system works by requiring the incoming
call to ring two phone numbers simultaneously, their system number and
your phone number, to determine if the incoming call is a robo-call.
If the call is a robo-call you will only hear that one ring.

How does it determine if its a robo-call? If by number, then its useless for
the vast majority of calls I'm getting now (they keep changing the number
they're "calling from").

It's no different than any other blacklisting technology -- except, that
*you* don't have to maintain the blacklist!

As telemarketers adapt, they'll randomize their use of spoofing numbers more
and any "common" database (e.g., like this) will loose its effectiveness.

You'll also see more obvious attempts to steal the *entire* contents of
your address book (think about your smart phone that is infectable!)
for lists of "valid" phone numbers.

What happens when TelemarketerInc starts using your Mom's phone number
in their CID spoofing? Not only will she not be able to call *you*
but she'll also not be able to call anyone else who uses the service!

Additionally, it leaks all your "metadata" to a third party -- that
may or may not be covered by any privacy legislation regarding "telephone
carriers".