EPS User State can contain two variable something like
EPS-User-State ::= < AVP header:1495 10415 >
[ MME-User-State ]
[ SGSN-User-State ]
*[ AVP ]
//contain the information related to the user state at MME.
MME-User-State ::= < AVP header: 1497 10415 >
[ User-State ]
*[ AVP ]
//contain the information related to the user state at SGSN.
SGSN-User-State ::= < AVP header: 1498 10415 >
[ User-State ]
*[ AVP ]
Possible User States
DETACHED
ATTACHED_NOT_REACHABLE_FOR_PAGING
ATTACHED_REACHABLE_FOR_PAGING
CONNECTED_NOT_REACHABLE_FOR_PAGING
CONNECTED_REACHABLE_FOR_PAGING
NETWORK_DETERMINED_NOT_REACHABLE