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

Don Kelly dk at donkelly.biz
Wed May 10 11:29:02 CDT 2017

You have an unusual situation--you suspect caller ID spoofing by a known

Under the Truth in Caller ID Act, FCC rules prohibit any person or entity
from transmitting misleading or inaccurate caller ID information with the
intent to defraud, cause harm, or wrongly obtain anything of value. Anyone
who is illegally spoofing can face penalties of up to $10,000 for each

Making it clear to your employees that spoofing will result in termination
might be enough.

Requiring employees to have a phone that you can locate would allow you to
check from time to time.


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Steve Edwards
Sent: Wednesday, May 10, 2017 10:12 AM
To: Asterisk Users Mailing List
Subject: [asterisk-users] How to detect fake CallerID? (8xx?)

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

Thanks in advance,
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST

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