Normal conversation termination extension with ISC

In a non-ISC environment, normal termination of IMS conversation mode occurs when the IMS transaction creates a blank in the transaction-code field of the conversational SPA prior to committing the reply message. The conversation ends when the reply message has been successfully dequeued.

An extension for normal termination has been made for ISC, because the peer-level application in the other half session can also now end the conversation. However, IMS supports this request for normal termination by receiving only an SNA-defined commit request - LUSTATUS X'0006' with EB. This occurs because of a stand-alone commit request (or normal termination) by the remote application to its subsystem. This form of conversational termination requires notification of the user using the Conversational Abnormal Termination exit routine (new input vector of X'28' in byte 3 of register 1), because committing changes might have been deferred by the completed conversational steps. This is possible by recording the deferred information within the conversational SPA. The exit routine can schedule an appropriate transaction to commit the deferred changes upon being invoked with the new vector.