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

[Sebastian Nielsen]

Since the callback happens immediately after hangning up, the risk of
answering a call that isn't theirs is minimal.
For those sites that divert their incoming calls to a PBX or answering
machine, you could have some config/database that excepts these sites from
callback verification.
(which means these sites run into risk of fake callerID).


Another variant could be that they must visit a specific website using a
Wifi or computer at the client. You record the IP.
Spoofing the IP in a TCP three-way handshake is almost impossible.

The thing is then to be able to record which IP is the client, but if your
services are ordered by the client via some web form, you could have that IP
be recorded as "client IP" and the employee must check in/check out from
that IP.

This could be used in unison with the phone verification, so the employee
can select which fits best for the enviroment.
(eg, they choose phone verification or web verification)

-----Ursprungligt meddelande-----
Från: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] För Don Kelly
Skickat: den 10 maj 2017 22:08
Till: 'Asterisk Users Mailing List - Non-Commercial Discussion'
<asterisk-users at lists.digium.com>
Ämne: Re: [asterisk-users] How to detect fake CallerID? (8xx?)

It's probably not practical to have them answering the client's telephone!
At a lot of sites, incoming calls would be handled by auto attendant,
diverted to answering service, etc.

  --Don


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Sebastian
Nielsen
Sent: Wednesday, May 10, 2017 2:46 PM
To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
Subject: Re: [asterisk-users] How to detect fake CallerID? (8xx?)

Use a callback.
So when clocking in/out, they will hear a random 4 digit PIN, like "Enter
four, three, six, eight at the callback".
After they hangup, the phone will ring, and then they will have confirm with
the 4 digit PIN.

If they arent in presence: the phone at the site will ring, and the person
at site (that isn't your employee) cannot carelessly just OK it because they
haven't heard the PIN.
If they are in presence: the phone at the site will ring, and the employee
will be able to enter the PIN they just heard. If they fake the callerID or
not at the initial call, does not matter, since you have verified with a
callback.

-----Ursprungligt meddelande-----
Från: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] För Steve Edwards
Skickat: den 10 maj 2017 19:13
Till: Asterisk Users Mailing List - Non-Commercial Discussion
<asterisk-users at lists.digium.com>
Ämne: Re: [asterisk-users] How to detect fake CallerID? (8xx?)

On Wed, 10 May 2017, J Montoya or A J Stiles wrote:

> Presumably your staff carry mobile phones.  What about an app that 
> gets the ID of the cell tower to which it is connected, and passes it 
> and the SIM number in a HTTP request to a server you control?

The problem is that they are supposed to use the 'site landline' to confirm
presence -- not their cell phone with the spoofed CID.

--
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
             https://www.linkedin.com/in/steve-edwards-4244281

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