An application invokes the bridge calls service after the local node assumes the role of a transit node between two calls. After this service is invoked, the stack at the local node forwards facilities and notification information between the two legs of the network path, without involving the application. However, basic call control signaling for the two calls (such as call clearing) is still managed by the application on the local node.
The bridge calls service is supported by the Q.SIG variant only.
Call bridging