OTMA unsolicited messages

OTMA clients must connect to every IMS system in the shared queue group in order to receive unsolicited messages. The OTMA client connections are necessary because transactions that might cause unsolicited messages can run on any IMS within the shared-queues group.

If the IMS that processes an unsolicited message (the back-end system) is a different IMS than the one that receives the message, the unsolicited message is delivered by the back-end system. Therefore, OTMA must also be enabled on the back-end IMS.