IMSIDs when IMSplexes and MSC coexist

The IMSplex uses IMSIDs to identify IMS systems and to route any messages that have an affinity to a specific IMS system. IMSIDs must be unique within each IMS in an IMSplex.

In an IMSplex-MSC network, IMSIDs must be unique throughout the entire MSC network, even the remote MSC IMS systems outside of the IMSplex.

IMSIDs are not required to be unique in MSC networks that do not include an IMSplex. When migrating an MSC network to an IMSplex with shared queues, make sure the IMSIDs of each IMS system are unique.