How to Set Up Free CID Spoofing with SIP Trunk and Asterisk

Setting up CID caller ID spoofing via a SIP trunk and Asterisk can be complex and involves legal considerations. While spoofing caller ID is often illegal when done with the intent to deceive, you can use it for testing or development purposes. Always check local laws and regulations before proceeding.

Setting Up Free CID Spoofing: General Overview

If you are looking to configure this for legitimate purposes such as testing or development, here is a general overview of how you can achieve CID spoofing with Asterisk:

Prerequisites

Asterisk Installed: Ensure you have Asterisk installed on your server. SIP Trunk Provider: Choose a SIP trunk provider that allows caller ID manipulation. Familiarity with Asterisk Configuration Files: Having a basic understanding of Asterisk configuration files is essential.

Steps to Configure CID Spoofing

Configure SIP Trunk

To set up your SIP trunk, follow these steps:

Open the file using a text editor. Add your SIP trunk details. Here's an example configuration:

[your_trunk]
typepeer
host
your_username
secretyour_password
fromuseryour_username
fromdomain

Set Up Dialplan

To specify the caller ID, you need to set up a dialplan. Follow these steps:

Open the file using a text editor. Set up a context for outgoing calls. Here's an example:

[outgoing]
exten  _X.,1,NoOp(Outgoing Call)
exten  _X.,n,Set(CALLERID(num)1234567890)
exten  _X.,n,Dial(SIP/{EXTEN}@your_trunk)
exten  _X.,n,Hangup

Reload Asterisk Configurations

After making changes, reload the Asterisk configurations with the following commands:

asterisk -rvvv
sip reload
dialplan reload

Make a Call

To test the setup, make a call from an extension configured in the outgoing context.

Important Considerations

Provider Policies

Ensure your SIP trunk provider allows caller ID spoofing. Some providers may block calls that do not match the registered caller ID.

Legal Issues

Be aware of the legal implications of spoofing caller ID. It is essential to use this capability responsibly and ethically.

Testing

Always test your configuration in a controlled environment before deploying it in a production setting.

Troubleshooting

If the caller ID does not show as expected, check the SIP trunk provider's settings and ensure there are no restrictions on their end. Use Asterisk logs located at /var/log/asterisk/full to troubleshoot any issues.

This setup is for educational purposes, and you should always use CID spoofing within the bounds of the law.