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Prerequisites:

• A working installation of Linux.

Installing Asterisk

- Login to your Linux system as user “root”
- Run the following commands to download Asterisk for free:

cd /usr/src
export CVSROOT=:pserver:anoncvs@cvs.digium.com:/usr/cvsroot
cvs login < --- Use anoncvs as the password
cvs checkout asterisk

- Run the following commands to compile Asterisk:

cd /usr/src/asterisk
make clean
make
make install
make samples

If you run into any problems with the Asterisk installation, consult the Asterisk Wiki for assistance.

Creating a NuFone Account

Fill out the NuFone Account Creation Form.

• Choose IAX as the signaling type.
• Choose “Pay as you go” as the plan.

After you complete the account creation process, you should receive an confirmation email from NuFone containing your login credentials.

Configuring Asterisk

- Login to your Linux system as user “root”
- Edit /etc/asterisk/extensions.conf and add the following lines to the end of the file. Be sure to substitute your own username and password!

[spoofing]
exten => _XXXXXXXXXX,1,dial,IAX2/username:password@switch-2.nufone.net/1${EXTEN}
exten => _XXXXXXXXXX, 2, congestion() ; No answer, nothing
exten => _XXXXXXXXXX, 102, busy() ; Busy

Creating the Call File

To spoof Caller ID for free using this method, you will need to know the following three bits of information.

• Your Phone Number
• The Phone Number of the Person You are Calling
• The Phone Number You are Spoofing

Create /tmp/spoof.call with the following lines. Remember to substitute your information for spoofnumber, yournumber, and callnumber. Please note that yournumber is the only one that requires a “1″ at the beginning.

Channel: IAX2/username:password@switch-2.nufone.net/1yournumber
Callerid: spoofnumber
MaxRetries: 5
RetryTime: 60
WaitTime: 30
Context: spoofing
Extension: callnumber
Priority: 1

Here is an example call file assuming the following details:

• My Number is 404-222-2222
• I want to call 404-333-3333
• I want to spoof the Caller ID as 404-867-5309

Channel: IAX2/username:password@switch-2.nufone.net/14042222222
Callerid: 4048675309
MaxRetries: 5
RetryTime: 60
WaitTime: 30
Context: spoofing
Extension: 4043333333
Priority: 1

Starting Asterisk

- Login to your Linux system as user “root”.
- Choose one of the following ways to start Asterisk. Don’t run both commands!
- Run the following command to start Asterisk in background mode:

/usr/sbin/asterisk

- Run the following command to start Asterisk in CLI mode:

/usr/sbin/asterisk -c

Spoofing Caller ID for Free

Now that you have Asterisk installed, configured, and running, it’s time to have a little fun with Caller ID.

- Login to your Linux system as user “root”
- Run the following command to initiate the spoofed Caller ID phone call:

cp /tmp/spoof.call /var/spool/asterisk/outgoing

- Asterisk will detect the call file and initiate an IAX call to your phone number. Once you answer the call, Asterisk will then dial the other number and bridge the two calls together.

Cautions and “Don’t Try This At Home” Disclaimer

Spoofing Caller ID for free using a NuFone account certainly violates their Terms of Service and will probably get your account suspended or terminated. There may also be other legal issues with spoofing Caller ID, but I’m not a lawyer.