← Back to SS7 Overview

SS7 Architecture

Explore the architecture of Signaling System 7 (SS7), its components, and how they work together to enable telecommunications signaling.

SS7 Architecture Overview
Understanding the fundamental structure of SS7 networks

Signaling System 7 (SS7) is a set of telephony signaling protocols used worldwide to set up and tear down telephone calls, as well as provide various other services in telecommunication networks. The SS7 architecture is designed to be robust, scalable, and efficient in handling signaling traffic separate from voice or data traffic.

SS7 Architecture Overview

Key characteristics of the SS7 architecture include:

  • Separation of signaling and voice/data channels
  • Packet-switched network for signaling messages
  • Hierarchical structure with different types of signaling points
  • Support for both circuit-switched and packet-switched networks
  • Standardized protocols for interoperability between different vendors and networks

The SS7 architecture forms the backbone of traditional telecommunications networks and continues to play a crucial role in modern hybrid networks that combine legacy systems with newer technologies.

SS7 Architecture in Modern Networks

While SS7 remains a critical component of many telecommunications networks, its role is evolving with the advent of newer technologies:

SS7 over IP (SIGTRAN)

Adaptation of SS7 protocols to run over IP networks, enabling integration with modern packet-switched infrastructures.

Learn More
Interworking with IMS

Integration of SS7 networks with IP Multimedia Subsystem (IMS) for seamless service delivery across different network types.

Explore IMS
Migration to Diameter

Gradual transition from SS7 to Diameter protocol in 4G and 5G networks, while maintaining interoperability.

Discover Diameter

Security Considerations in SS7 Architecture

Vulnerabilities and Mitigation Strategies
Understanding the security challenges in SS7 networks

  • Lack of Built-in Authentication

    SS7 was designed with implicit trust between network operators. Implement additional authentication mechanisms and network segmentation.

  • Global Title Translation Abuse

    Attackers can exploit GTT to route messages to unauthorized destinations. Use GTT filtering and implement strict access controls.

  • Interconnection Vulnerabilities

    Risks associated with interconnecting with other networks. Implement firewalls and monitoring at network boundaries.

  • Signaling Link Congestion

    Potential for DoS attacks by flooding signaling links. Implement traffic rate limiting and prioritization mechanisms.

Dive Deeper into SS7 Security

Explore our comprehensive guide on securing SS7 networks and protecting against common vulnerabilities.

SS7 Security Guide