When a MS moves from one MSC area to another during a call, a handover procedure has to be performed in order to
continue the communication. For that purpose the MSCs involved have to exchange data to initiate and then to realize
This interface is also used to forward short messages, to perform location for a target MS for which handover has
occurred on an established call and to transfer LCS messages to and from an LMU for which handover of a signalling
channel has occurred.
This interface is also used to transfer information for inter-MSC VBS/VGCS calls.