[asterisk-users] How to detect fake CallerID? (8xx?)

Andrew Latham lathama at gmail.com
Wed May 10 10:35:50 CDT 2017

On Wed, May 10, 2017 at 10:11 AM, Steve Edwards <asterisk.org at sedwards.com>

> I have a 'time and attendance' application. Think janitorial or security
> kind of thing where an employee goes from location to location.
> They're supposed to 'clock in' when they get to a site using a phone at
> that site to prove they're there.
> Some employees have discovered 'fake caller ID' services can be used to
> say they're on site when they are not.
> How can I detect a fake CallerID? The INVITE looks the same to me.
> If I have the employees call an 8xx number, can I ask my SIP provider to
> include more headers to show the real ANI? What would that service be
> called?
> --
> Thanks in advance,
> -------------------------------------------------------------------------
> Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
>             https://www.linkedin.com/in/steve-edwards-4244281
For dangerous material sites a call back was used. They call in and get a
code, the system calls back and asks for the code. Convoluted yes, the call
back was all that was really needed to thwart the fraud. A simple RFID pad
setup could be built to use low usage GSM plan to tag in the RFID on site.
But this is beyond the scope of telephony.

- Andrew "lathama" Latham  -
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