How to block calls from specific countries

You can block all calls originating from one or more countries by adding their country code prefixes to a Caller ID Prefix filter in a call flow, then routing those prefixes to Hang Up.

All other callers continue through the flow normally.

Step 1. Open the Call Flow Builder

• Go to Tracking > Call Flows.
• Click Create to build a new call flow, or click an existing one to edit it.

Step 2. Choose how to start (new flows only)

• Select From Scratch or From Template.
• If using a template, pick Simple Call Flow as the base and delete the pre-existing Dial action before continuing.

Step 3. Add the Caller ID Prefix filter

• Click the + button on the canvas.
• Select Caller ID Prefix from the Filters menu.

Step 4. Enter the country codes to block

• Type the international dialling prefix for each country you want to block (e.g. +44 for the UK, +49 for Germany).

Step 5. Route the blocked prefixes to Hang Up

• Click the + on the branch for the prefixes you entered.
• Select Hang Up.

Step 6. Route all remaining callers to a destination

• Click the + on the remaining-callers branch.
• Select Dial and choose the destination number.

🎉 Done. Callers from the blocked countries will hear a hang-up immediately, while everyone else connects normally.

Detailed Guide: How to use the caller ID prefix filter for Geo-routing

Detailed Guide: How to block unwanted or spam callers

Detailed Guide: How to assign tracking numbers to call flows

Updated on: 01/04/2026