diff --git a/src/libvlr/vlr_access_req_fsm.h b/src/libvlr/vlr_access_req_fsm.h
new file mode 100644
index 0000000..8386da6
--- /dev/null
+++ b/src/libvlr/vlr_access_req_fsm.h
@@ -0,0 +1,17 @@
+#pragma once
+
+enum proc_arq_vlr_state {
+	PR_ARQ_S_INIT,
+	/* Waiting for Obtain_Identity_VLR (IMSI) result */
+	PR_ARQ_S_WAIT_OBTAIN_IMSI,
+	/* Waiting for Authenticate_VLR result */
+	PR_ARQ_S_WAIT_AUTH,
+	PR_ARQ_S_WAIT_CIPH,
+	PR_ARQ_S_WAIT_UPD_LOC_CHILD,
+	PR_ARQ_S_WAIT_SUB_PRES,
+	PR_ARQ_S_WAIT_TRACE_SUB,
+	PR_ARQ_S_WAIT_CHECK_IMEI,
+	PR_ARQ_S_WAIT_TMSI_ACK,
+	PR_ARQ_S_WAIT_CECK_CONF,
+	PR_ARQ_S_DONE,
+};