How messages are routed in an MSC network

In an MSC network, IMS uses remote transactions, remote logical terminal (LTERM) names, and SYSIDs to route the messages through the MSC network.

Remote transactions are defined either dynamically with the CREATE TRAN command or statically by specifying remote and local SYSIDs in the TRANSACT macro. Remote LTERMs are defined either dynamically by the CREATE LTERM command, or statically with the NAME macros immediately following an MSNAME macro in the stage-1 system definition.

MSNAME labels can also be used as intermediate destination names, when messages must pass through an intermediate IMS system prior to reaching the IMS system that contains the true destination name. In this case, the MSNAME label is also stored in the message prefix.