DNO Query
DNO Query
- DNO Overview (Click here to complete our DNO Query service request form) Do-Not-Originate (DNO) list is required by both FCC and FTC rules to assure that your network is not carrying calls with false or unauthorized ANIs. This list contains over 1.03 billion numbers, and is updated monthly. FCC Call-Blocking Rules: What You Need to Know (Effective December 15, 2025) On September 16, 2025 the FCC confirmed that under its “Advanced Methods To Target and Eliminate Unlawful Robocalls” rule, a firm effective date of December 15, 2025 is set for key obligations coming under that rule. As of that date, all U.S. voice service providers (not just gateway providers) must enable blocking of calls using invalid, unallocated, or “do-not-originate” (DNO) numbers — i.e. phone numbers that should never be used to place outbound calls. The “DNO blocking mandate” is intended to prevent calls from numbers that are clearly not rightful originators (unallocated, unused, inbound-only, or previously flagged). For providers subject to this mandate, that means routing/validation systems must be ready — capable of real-time checks against authoritative numbering databases, and automatically blocking blocked-list calls. In short: the December 15 deadline enforces a blocking requirement (DNO-based blocking), which is one of several layers of the FCC’s anti-spoofing/robocall mitigation framework. FCC Call-Blocking Rules: What You Need to Know (Effective December 15, 2025) DNO Controls & Customer Guidance The FCC’s new nationwide call-blocking requirements took effect on December 15, 2025, marking the most aggressive effort yet to eliminate illegal robocalls and spoofed-origin traffic. Under the Advanced Methods to Target and Eliminate Unlawful Robocalls order, all U.S. voice providers must now block calls that originate from invalid, unallocated, unused, or Do-Not-Originate (DNO) numbers. 1 Call Connect has implemented all required rules across our network and now provides expanded DNO options—giving customers granular control over advanced number-blocking categories for stronger protection and higher call integrity. 1. FCC Mandated Blocking (Required for All Providers) Effective December 15, all providers must automatically block calls that originate from: Invalid number formats Unallocated or unused ranges Numbers on DNO lists (government or carrier-level) Subscriber-designated inbound-only numbers Numbers that cannot lawfully originate calls These blocks occur upstream—before calls ever reach the PSTN—and do not require notifying end users. 2. DNO Dataset (Dec 01, 2025) Optional Categories Customers Can Enable
- In addition to the federal baseline rules, customers can selectively enable a high-precision DNO dataset for enhanced protection. Category Number Count Description
- (6) 1,424 Federal gov’t + robtrap numbers. (7) 283,335 Inbound-only Federal & state gov’t agencies; other customer-service lines. (8) 740,027,099 All U.S. wireless numbers. (9) 5,708,610 Washington, DC 202 & 771 area codes. (11) 10,076,992 Commercial switch-platform ANI rejects. (12) 11,039,575 SIP 608 vendor-rejected numbers. TOTAL: 767,137,035 Choosing Your Categories Recommended for most customers: Categories 6, 7, 11, 12 Aggressive (special use only): Category 8 (blocks all wireless - originating calls) Targeted (government/advocacy/political): Category 9 Your default configuration includes only FCC-required blocking unless you have previously requested additional enforcement. 3. Why Your Outbound Traffic May Be Affected If one of your outbound numbers appears on a DNO list or enabled category: The call will be blocked before reaching the public network. Carriers are not required to alert you or your end user. Outdated or misclassified number inventories increase false positives. This makes proactive inventory management crucial for uninterrupted call delivery. 4. Recommended Customer Actions A. Review Your Active Number Inventory Send us your outbound Caller ID numbers for verification: Allocation status Ownership confirmation Geographic validity Inbound/outbound classification
- B. Subscribe to our DNO services, and select your DNO categories You may enable or disable DNO categories at any time. Most customers activate 6, 7, 11, and 12 for enhanced protection. C. Identify Inbound-Only Numbers We will designate these as subscriber DNO to avoid compliance conflicts. D. Report Suspected False Blocks We can trace DNO flags, carrier dispositions, and blocking surfaces quickly. 5. What’s Coming Next? Verified Caller Identity Rules Separately, the FCC is advancing rules that would require terminating carriers to display verified caller identity data (caller name + identity metadata) when a call carries A-level STIR/SHAKEN attestation. These rules are not yet in effect, but we expect they will drive industry-wide CNAM and identity upgrades in 2026.
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