Routing messages through MSC to an ISC LTERM
You can route messages across an MSC link to an ISC half session.
Suppose you have a setup similar that shown in the following figure. IMS A and IMS B connected by an MSC link. SYS C is connected to IMS B with an ISC link. If you want to route input messages and output replies between IMS A and SYS C, place the ISC routing parameters in the IMS prefix portion of the message. The MSC link-processing preserves these routing parameters.