Cellular Network Infrastructure » Core Network (CN) » OsmoMSC

According to TS 24.007 Section 11.2.3.2.3, it is possible that uplink L3 messages are duplicated in some scenarios, particularly during assignment/handover procedure.

To avoid L3 entities from seeing duplicated messages, there's a modulo-2 or modulo-4 message sequence counter, baesd on which the MSC can detect and suppress such duplicate messages.

OsmoMSC doesn't contain any related code AFAICT.