Blocklist

The Blocklist module helps you manage unwanted calls by automatically terminating calls from specific phone numbers or suspicious caller IDs.

Common Uses

• Block spam or nuisance callers
• Filter out automated calls
• Prevent calls with suspicious caller IDs
• Manage call access control
• Protect your phone system from abuse

Setting It Up

Configure your blocklist with these settings:

1. Name: Give your blocklist a descriptive name (e.g., "Spam Filter" or "Security Blocklist")

2. Additional Settings:

   • Block empty Caller IDs: Automatically block calls with no caller ID
   • Block Caller IDs containing letters: Block calls where the caller ID includes alphabetical characters

3. Blocked Numbers: Add specific phone numbers to block

   • No format restrictions (E.164 not required)
   • No limit on number of digits
   • Add multiple numbers as needed
   • Remove numbers using the "X" icon

note

Blocked calls are terminated immediately and will not proceed to any modules connected after the Blocklist.

How It Works

The Blocklist evaluates incoming calls in this sequence:

1. Checks if caller ID is empty (if enabled)
2. Checks if caller ID contains letters (if enabled)
3. Compares against list of blocked numbers
4. If any check is positive → Call is terminated
5. If all checks pass → Call proceeds to next module

Practical Example

This example shows a typical setup:

1. Incoming calls arrive through a phone number or via the iOS/Android App configuration.
2. Blocklist filters unwanted calls
3. Valid calls proceed to the Voice Menu

Best Practices

• Regularly review and update blocked numbers
• Test blocklist settings before going live
• Document reasons for blocked numbers
• Consider using Caller Router for more complex filtering
• Keep backup of blocked number list
• Monitor blocked call patterns

Advanced Tips

Feature	Description	Best For
Empty CLI Blocking	Block calls with no caller ID	Preventing anonymous calls
Letter Detection	Block alphanumeric caller IDs	Filtering automated systems
Number Blocking	Block specific phone numbers	Known spam numbers
Flexible Format	Any number format accepted	International numbers

Important Considerations

• Blocked calls are terminated immediately
• No notification is sent to blocked callers
• Blocking is based on exact number matches
• Keep your blocklist up to date
• Consider legitimate uses of blocked features (e.g., some business systems use alphanumeric caller IDs)