SESSION INITIATION PROTOCOL EXTENSIONS FOR CALL CONTROL AND RESOURCE STATUS MONITORING IN TURRETS AND TURRET SWITCHING SYSTEMS

Systems, methods, and computer program products are provided for controlling calls and monitoring resource status for turret systems. A SIP message including at least one of a header field and an event package is received from a SIP user agent over a communication network. The header field includes a first parameter corresponding to a first call feature and the event package includes a second parameter corresponding to a second call feature. At least one of the first call feature and the second call feature is implemented by the Softswitch or a SIP-enabled turret in response to the receiving.