FreePBX typically uses feature codes to provide users with direct control over certain system functions from their handset or softphone. For blacklisting, there are two primary methods: blacklisting the last caller and blacklisting a specific number.

Blacklisting the Last Caller

To blacklist the last number that called your extension, follow these steps:

1. Hang up the unwanted call.
2. From your handset or softphone, dial the feature code for "Blacklist Last Caller". The default FreePBX feature code for this is usually *32.
3. You should hear an audio confirmation that the last caller has been blacklisted.

Blacklisting a Specific Number

To blacklist a specific telephone number that did not necessarily call you last:

1. From your handset or softphone, dial the feature code for "Blacklist a Number". The default FreePBX feature code for this is usually *31.
2. You will then be prompted to enter the full telephone number you wish to blacklist.
3. Press the '#' key after entering the number to confirm.
4. You should hear an audio confirmation that the number has been blacklisted.

Important Considerations:

• Feature Code Verification: The exact feature codes (30, 31) may vary if your FreePBX administrator has customised them. If these codes do not work, please contact your IT support for the correct codes.
• Number Format: When blacklisting a specific number, ensure you enter the full number, including any required trunk prefixes or international dialling codes, exactly as it appears when they call you (e.g., 0XXXXXXXXXX for a UK number).
• Blacklist Management: Numbers added to the blacklist will typically be blocked from calling your extension or the entire PBX, depending on the system configuration. Removing numbers from the blacklist usually requires administrator access to the FreePBX web interface.