Stop Unwanted Calls
Before They Connect
Multi-layered call blocking that protects your network from spam, fraud, and unwanted traffic. Block by phone number, prefix, or media IP — with real-time dashboards and zero-touch configuration.
How Call Blocking Works
Three independent layers of protection, working together to keep your network clean.
Phone Number Blocking
Block calls by specific phone number or prefix pattern. Upload CSV lists of numbers to block, or manage them one-by-one through the dashboard. Supports directional blocking — block inbound, outbound, or both.
- Exact number matching
- Prefix/pattern matching
- Directional (to/from/both)
Media IP Blocking
Block calls based on the media IP address of the answered call. Unlike other solutions that check the IP from early ringing events (180/183), we verify the actual media IP after the call is answered — defeating providers that switch media IPs to FAS farms mid-call.
- Post-answer IP verification
- Defeats FAS farm IP switching
- CSV bulk upload support
Why Media IP Blocking Matters
Fraudulent providers have become sophisticated. They present a clean media IP during the ringing phase (SIP 180/183), then switch to a FAS (False Answer Supervision) farm IP once the call is answered. Traditional blocking solutions that inspect the early media IP are easily bypassed.
Netpaladin's Media IP Blocking waits until the call is fully answered before checking the media IP. This means the actual media path — the one that will carry audio for the duration of the call — is what gets validated. If the answered media IP matches a blocked address, the call is terminated immediately.
How it defeats FAS farms
Ringing IP (180/183) → Clean IP shown
Answered IP (200 OK) → Actual media IP checked
If blocked → Call terminated instantly
Media IP Blocking Flow
Call rings (180/183)
Early media IP is presented — we ignore it
Call answered (200 OK)
Actual media IP is now established
IP checked against blocklist
Real-time lookup against your configured IP blocklist
Decision enforced
Blocked IP → call terminated. Clean IP → call proceeds normally
Powerful Dashboard & Management
Everything you need to monitor and manage call blocking in one place.
Blocklist Management
Manage your phone number and IP blocklists through an intuitive dashboard. Upload CSV files for bulk operations, or add entries one at a time. Up to 1,000 entries per list with instant synchronization.
- Phone number blocklist
- Media IP blocklist
- CSV bulk upload with deduplication
- Instantly applied
Real-Time Analytics Dashboard
Visualize your call blocking performance with interactive charts and metrics.
Filtering Breakdown
Interactive pie chart showing the ratio of filtered vs allowed calls. Instantly see how much traffic your blocking rules are catching.
ACL Block Categories
Bar chart breaking down ACL blocks by direction — None, From, To, and Both. Understand which direction generates the most blocked traffic.
Daily Trends
Line chart tracking filtered and total calls over time. Spot trends, identify attack patterns, and measure the effectiveness of your blocking rules.
Easy to Configure, Instant to Deploy
No complex setup. No downtime. Just enable and go.
Get Started in Minutes
Go to Call Blocking in your dashboard
Add phone numbers or IPs manually, or upload a CSV for bulk operations
Changes take effect immediately — no waiting required!
API-First Architecture
Integrate call blocking checks directly into your application with a simple REST API.
POST /api/callblocking/check-media-ip
Content-Type: application/json
Authorization: Bearer YOUR_API_KEY
{
"ip": "5.161.236.63"
}
// Response
{
"blocked": true,
"ip": "5.161.236.63"
}Ready to Stop Unwanted Calls?
Protect your network with multi-layered call blocking. Start blocking spam, fraud, and FAS farm traffic today.