Numbering Plan

A numbering plan defines the format and assignment of telephone numbers within a country or region, including area codes, mobile ranges, premium and toll-free ranges. National numbering plans operate within the global ITU-T E.164 framework, and are managed by the national regulator. Misallocation or reuse of number ranges has direct fraud and routing implications.

Categories: Radio Access NetworkFraudProtocols and Standards

Numbering Plan in context

The radio access network is the layer where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations, downgrade attacks and jamming, and defenses hinge on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

Telecom fraud costs operators an estimated $40+ billion per year. Common vectors include International Revenue Share Fraud (IRSF), Wangiri callback scams, SIM box bypass, PBX hacking, subscription fraud and A2P grey routing. Effective defense combines real-time signaling analytics with CDR-side machine learning.

To place Numbering Plan in the wider telecom-security picture, review MCC, NESAS, Revenue Share Fraud, Blue Team, E.164 and ITU.

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