Introduction to Call Spoofing - Trick to Make Fake Calls

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For most of the phone users, call spoofing is an unknown word. But it is most dangerous threat used by attackers to abuse phone calls.

Call Spoofing

Call Spoofing is the process of tricking telephone network to change the recipient's Caller ID display on with a fake number and not the actual caller's  number.

By using call spoofing, attacker can make a call appear to be coming from any number. It does not matter whether the showing number is valid  or not. People always trust on the number displayed on the caller id, it can be dangerous threat and can cost big loss.

There are many technologies exists that allow call spoofing but the most popular ways are VoIP and PRI lines.

How to perform call spoofing:

If you are thinking that call spoofing is a complex attack and require enough knowledge of calls and their working, you are wrong. By using many web based service, a child can also play with this attack. All those web based services are free and allow users to call for some specific amount of time. To call more, users need to pay and purchase credits. But these credits are cheaper.

To make a spoofed call, you only need to specify the caller's number and receiver's number. The number which you had specified in the caller's number will be used to show on the caller ID at the receiver's side.

I have already posted about call spoofing attack with crazycall
Call Spoofing attack


Come call spoofing services also allows users to change voice and record calls.

How call Spoofing Works

I am just trying to write simple process of how it works and not going in deep technical details. 

A typical call spoofing process involved three things.

1. source number
2. destination number
3. Caller ID number

When the user completes this form and clicks a button to initiate the call, the source number is first called. When the source number line is answered, the destination is then called and bridged together.

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