A SIP PRI gateway » is a device that converts digital **** signals from a SIP (Session Initiation Protocol) network into PRI (Primary Rate Interface) signals that can be transmitted over a traditional T1/E1 line. This allows businesses to connect their SIP-based phone systems to their existing PBX systems that use PRI lines for communication. The SIP PRI gateway acts as a bridge between modern SIP technology and legacy PRI infrastructure, enabling seamless communication between the two systems.