Signaling System No. 2 (SS2) is a communication protocol used in the telecommunications industry, primarily for signaling between telephone exchanges. It enables the setup, management, and termination of calls, ensuring that the necessary information is transmitted efficiently. SS2 is part of the broader Signaling System No. 7 (SS7) family, which is essential for modern telephony. This system allows for various functions, including call routing, billing, and mobile services. By using SS2, network operators can ensure reliable communication and maintain the quality of service for users. It plays a crucial role in connecting different networks and facilitating seamless communication.