What is a primary function of the QSIG protocol?

The primary function of the QSIG protocol is to facilitate signaling for telephony between Private Branch Exchanges (PBXs). QSIG, which stands for Q Signaling Protocol, is an important standard used in telecommunication that allows for the exchange of signaling information concerning calls between different PBXs. It supports various call handling features such as call transfer, conference calling, and mobile extensions. QSIG enhances interoperability between different systems and vendors, making it easier for businesses with multi-vendor PBX environments to communicate effectively.

By using this protocol, organizations can ensure seamless communication across different sites and systems, thereby improving the efficiency of their telecommunications infrastructure. This characteristic of QSIG is particularly vital in larger organizations where multiple PBXs are in operation.