Managing SYSIDs when MSC and IMSplexes coexist

Local SYSIDs must be unique in an MSC network. Local SYSIDs are not required to be unique within an IMSplex; however, local SYSIDs owned by IMSplex members linked to an MSC network outside of the IMSplex must be unique in that MSC network.

Also, if multiple members of an IMSplex link to the same IMS system outside of the IMSplex, each IMSplex member must use a local SYSID that is unique to that outside IMS system.

You cannot use the same remote SYSID to point to different IMS systems in an MSC network.