What is SS7?

Signaling System 7 (SS7) is a set of protocols used to control and manage the signaling network in telecommunications. It was developed in the 1970s and has since become the standard for signaling in fixed and mobile networks worldwide. SS7 enables the exchange of information necessary for call setup, routing, and other network services.

It is the backbone of our modern communication infrastructure, allowing us to make calls, send texts, and access various services.

Originally designed for trusted networks, SS7 was not built with security in mind. As a result, it has become vulnerable to exploitation by hackers who can intercept and manipulate communication data.

How Does SS7 Software Work?

SS7 software operates on a separate network from the voice and data traffic, ensuring efficient and reliable signaling communication. It uses a packet-switched network to transmit signaling messages between various network elements, such as switches, routers, and databases. The SS7 protocol stack consists of different layers, each serving a specific function:

• Physical Layer: Handles the transmission of signaling messages over physical media, such as copper or fiber-optic cables.
• Data Link Layer: Provides error detection and correction mechanisms for reliable data transmission.
• Network Layer: Handles the routing of signaling messages between different network elements.
• Transport Layer: Ensures the reliable delivery of signaling messages between network elements.
• Application Layer: Implements the specific services and functions required for call setup, routing, and other network services.

Functions of SS7 Software

SS7 software performs a wide range of functions that are essential for the smooth operation of telecommunication networks. Some of the key functions include:

1. Call Setup: SS7 enables the establishment of voice and data calls by exchanging signaling messages between network elements.
2. Number Portability: SS7 allows users to retain their phone numbers when switching service providers.
3. Short Message Service (SMS): SS7 supports the exchange of text messages between mobile devices.
4. Location-Based Services: SS7 enables the provision of location information for emergency services and value-added services.
5. Roaming: SS7 facilitates the seamless handover of calls and data sessions between different networks, ensuring uninterrupted service for mobile subscribers.
6. Intelligent Network Services: SS7 enables the implementation of advanced network services, such as call forwarding, call waiting, and prepaid billing.

SS7 software plays a crucial role in the functioning of telecommunication networks, enabling efficient and reliable signaling communication. Its various functions, such as call setup, number portability, and location-based services, contribute to the seamless operation of voice and data services.