- EMM status message is used to report errors detected on the received EMM protocol messages.
- This message can be initiated by either UE or MME.
- No state transitions are seen from radio interface on receiving this message.
- Shall trigger in connected mode.
- If UE receives a EMM or ESM message with with message type not defined for protocol discriminator or not implemented by the receiver, UE will send EMM status message with EMM cause as #97 Message type not existent or not implemented.
- Other EMM causes which will be sent in EMM status are
#100 conditional IE errors
#95 semantically incorrect message