Author: FaxCore Technical Engineering Team (Enterprise Solutions Architecture & Systems Engineering)

Published: October 19, 2026 Updated: October 19, 2026 Verified Architecture

Enterprise & Regulatory Compliance Notice: This documentation is authored and maintained by FaxCore certified engineers for enterprise administrators. For formal regulatory audits (HIPAA, SOX, GDPR, PCI-DSS), verify your configuration with your organization's compliance officer. Read our full Compliance Disclaimers & Terms.

Blacklist Publications & Subscriptions

FaxCore allows administrators to prevent transmission to restricted numbers (e.g., premium toll lines, 900/976 numbers, emergency services, or customer opt-outs) through Blacklist Publications.

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1. Creating a Blacklist Publication

1. In the Admin Panel, navigate to Global Settings > Blacklist Publication.
2. Click New:

3. Enter a descriptive Name (e.g., Do Not Dial List or Emergency Block).
4. In the Dial String field, input forbidden number prefixes (e.g., 911, 900, 999).
5. Click New after each prefix to add it to the list.
6. Click Save & Close.

Important

Prefix Comparison Logic Wildcards (*) are not used in blacklist definitions. FaxCore performs left-to-right prefix matching:

• Blacklisted String: 999
• User Enters: 9991114444
• Match Result: BLOCKED

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2. Subscribing Users and Domains

After creating a publication, enforce it by subscribing domains or individual users:

1. Navigate to Domain Settings > Blacklist Subscription.
2. Click the Subscribe icon next to the target publication:

3. In the left panel, select entire domains to enforce the blacklist globally across all domain accounts.
4. Alternatively, use the right panel to selectively subscribe individual users.
5. Click Save and Close. Any attempt by subscribed accounts to dial blocked numbers will be immediately rejected with an audit failure notification.