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In order for the mac-nr dissector to know how to dissect a DRB lcid, it needs to know how the mode, SN length and drb number . The mac-nr preference, 'Source of LCID -> drb channel settings' is used to control this. The preferred method is 'From configuration protocol', which would work if unencrypted RRC appears in the trace, but if this is not possible, use 'From static table'. In this case, you need to open up 'LCID -> DRB Mappings Table' and manually configure RLC bearers for the LCIDs that are in use.