Abstract: The Flexible Enhanced Signaling Subsystem (FESS) performs table-driven processing of incoming and outgoing messages and also handles multiple message types and trunk groups. A message received by the FESS is first processed by an incoming signaling module which performs all necessary transformations to the message to enable the existing switch processing to handle any incoming message. The incoming signaling module, being table-driven, can be easily modified to handle any new message types which may be created. The message is then processed by an intermediate signaling module which includes the existing call processing, The intermediate signaling module may pass through messages, or it may generate new messages. In either case, an outgoing signaling module performs all necessary transformations to messages output from the intermediate signaling module to enable the outgoing trunk, downline switch or downline network to handle the message properly.

Abstract: A plurality of release action tables are maintained in the switching nodes of a telecommunication network, e.g SS7, ISDN, one table for each trunk group. The table indicates desired actions or treatments to be taken for failed calls, each identified by a cause condition. Upon receiving a cause condition expressed as a code at a switching node, a release action table index is accessed to identify the release action table for the trunk group experiencing the cause condition. The cause code is compared against entries in the release action table by a control program included in the switching node. Based upon such comparison, the table indicates to the network the corrective action to be taken to remedy the failed call condition. Changes to the network for failed call conditions are accomplished by altering the data in the release action table rather than changing network.