TETRA trunk tracker & plug-in v1.0.9 (hotfix #6) can show MS registrations.

MS Registrations tab can show e.g. following message types
BS disabled MS: Comfirm:  Temporary  Equipment not to be disabled:  TAC: x FAC: x ESN: x SSI: x xSSI: x

BS enabled MS: Comfirm:  Equipment not to be enabled:  TAC: x FAC: x ESN: x SSI: x

MS request for registration REJECTED for SSI: x - Roaming location updating CAUSE: Illegal MS (system rejection)

OTAR: SCK_Reject SSI: x

MS request for registration REJECTED for SSI: x - Periodic location updating CAUSE: Requested cipher key type not available (cell rejection)

Authentication_Result: Authentication failed

MS request for registration REJECTED for SSI: x - Demand location updating CAUSE: Identified cipher key not available (cell rejection)

MS request for registration REJECTED for SSI: x - Service restoration migrating location updating CAUSE: Roaming not supported (LA rejection)

OTAR: GCK_Reject SSI: x

MS request for registration REJECTED for SSI: x - Periodic location updating CAUSE: LA unknown (LA rejection)

MS request for registration REJECTED for SSI: x - Service restoration migrating location updating CAUSE: Identified cipher KSG not supported (cell rejection)

MS request for registration REJECTED for SSI: x - Demand location updating CAUSE: Use of DA cell not permitted (cell type rejection)

MS request for registration REJECTED for SSI: x - Service restoration migrating location updating CAUSE: Ciphering required (cell rejection)

MS request for registration REJECTED for SSI: x - ITSI attach CAUSE: Illegal MS (system rejection)

OTAR: CCK_Reject SSI: x

MS request for registration REJECTED for SSI: x - Service restoration roaming location updating CAUSE: Migration not supported (system rejection)

MS request for registration REJECTED for SSI: x - Periodic location updating CAUSE: Congestion (cell rejection)

MS request for registration REJECTED for - ITSI attach CAUSE: Congestion (cell rejection)

OTAR: GSKO_Reject SSI: x

MS request for registration REJECTED for SSI: x - Demand location updating CAUSE: Mandatory element error (system rejection)

MS request for registration REJECTED for SSI: x - Demand location updating CAUSE: No cipher KSG (cell rejection)

MS request for registration REJECTED for SSI: x - ITSI attach CAUSE: LA not allowed (LA rejection)

MS request for registration REJECTED for SSI: x - Disabled MS updating CAUSE: ITSI/ATSI unknown (system rejection)

OTAR: DM_SCK_Activate SSI: x

MS request for registration REJECTED for SSI: x - Service restoration migrating location updating CAUSE: Message consistency error (system rejection)

MS request for registration REJECTED for SSI: x - Service restoration migrating location updating CAUSE: Forward registration failure (cell rejection)

MS request for registration REJECTED for SSI: x - Migrating location updating CAUSE: Service not subscribed (LA rejection)

MS request for registration REJECTED for SSI: x - Service restoration migrating location updating CAUSE: Ciphering required (cell rejection)

MS request for registration REJECTED for SSI: x - Service restoration migrating location updating CAUSE: Network failure (cell rejection)

MS request for registration REJECTED for SSI: x - Periodic location updating CAUSE: Use of CA cell not permitted (cell type rejection)

MS request for registration REJECTED for SSI: x - Service restoration migrating location updating CAUSE: Authentication failure (system rejection)

MS request for registration REJECTED for SSI: x - Service restoration roaming location updating CAUSE: Migration not supported (system rejection)

MS request for registration REJECTED for SSI: 5612405 - ITSI attach CAUSE: Message consistency error (system rejection)

BS acknowledges MS initiated attachment/detachment of group identities GSSI:x SSI: x All attachment/detachments accepted