SS7 Interconnect Security

Security controls specific to SS7 protocol communications between interconnecting networks. Includes SS7 firewall deployment, Global Title filtering, message authentication, topology hiding, and protection against SS7-specific attacks (location tracking, call interception, SMS spoofing). Critical for legacy 2G/3G networks and interconnect scenarios.

Categories: SignalingRoaming and InterconnectSecurity Controls

SS7 Interconnect Security in context

Signaling protocols carry the control-plane instructions that set up calls, register subscribers, hand over sessions and route SMS. SS7, Diameter, GTP-C and SIP are the four dominant families, and interconnect exposure of any of them is treated by GSMA FS.11 / FS.19 / FS.20 as a top-tier telecom risk.

Roaming and interconnect are where two operators, often with an IPX or GRX carrier in between, exchange signaling and user-plane traffic. Trust boundaries here are the primary attack surface for location tracking, SMS interception and fraud, which is why GSMA now mandates SEPP with PRINS on 5G interconnect.

To place SS7 Interconnect Security in the wider telecom-security picture, review Diameter Interconnect Security, N32 Interface (5G), Signaling Firewall, SEPP Security, STP and Mitigation.

Related terms

Related topic hubs

  • Signaling Firewall Unified SS7/Diameter/GTP/SMS signaling firewall framework.
  • SS7 Firewall GSMA FS.11 category 1/2/3 SS7 message screening at the STP edge.
  • Diameter Attacks S6a IDR/PUR/CLR abuse, subscriber tracking, LTE signaling attacks.
  • Roaming Security IPX/GRX interconnect risk, home-routed vs local-breakout, SEPP.

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