PrepareSubsequentHO-Res  Message

This service is used between MSC-B and MSC-A (E-interface) to inform MSC-A that it has been decided that a handover or relocation to either MSC-A or a third MSC (MSC-B') is required. The MAP_PREPARE_SUBSEQUENT_HANDOVER service is a confirmed service Supplier is MSCB if Consumer is MSCA. This is a supplier invoke.

Reference: TS 29.002-f30