SS7 (Signaling System 7)

Is a telecommunications protocol suite used for controlling and managing telephone calls and text messaging.

SS7 brief overview:

Signaling Protocol: SS7 is primarily a signaling protocol, not for transmitting voice or data. It’s used to set up, manage, and tear down telephone calls and text messages in a public switched telephone network (PSTN).
Global Standard: SS7 is a global standard used by telecom networks worldwide, making it an essential component of modern telecommunications infrastructure.
Call Establishment: SS7 handles call setup, including call routing, number translation, and call authorization.
Call Management: It manages established calls, allowing for functions like call forwarding, call waiting, and call holding.
Text Messaging: SS7 enables the exchange of SMS (Short Message Service) messages.
Number Portability: It supports number portability, allowing users to keep their phone numbers when switching carriers.
Billing Information: SS7 is used to collect call detail records for billing purposes.
Mobile Roaming: It plays a crucial role in facilitating mobile phone roaming between different networks.