diff --git a/src/libvlr/vlr_auth_fsm.c b/src/libvlr/vlr_auth_fsm.c
index 5207464..b5052b0 100644
--- a/src/libvlr/vlr_auth_fsm.c
+++ b/src/libvlr/vlr_auth_fsm.c
@@ -257,7 +257,7 @@
 	LOGPFSM(fi, "Authentication terminating with result %s%s%s\n",
 		auth_fsm_result_str[result],
 		cause ? ", cause " : "",
-		cause ? get_value_string(gsm48_gmm_cause_names, cause) : "");
+		cause ? gsm48_reject_value_name(cause) : "");
 
 	/* Do one final state transition (mostly for logging purpose)
 	 * and set the parent_term_event according to result */
diff --git a/tests/msc_vlr/msc_vlr_test_gsm_authen.err b/tests/msc_vlr/msc_vlr_test_gsm_authen.err
index 6317820..94c1694 100644
--- a/tests/msc_vlr/msc_vlr_test_gsm_authen.err
+++ b/tests/msc_vlr/msc_vlr_test_gsm_authen.err
@@ -3271,7 +3271,7 @@
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
 DVLR SUBSCR(IMSI-901700000004620) AUTH on GERAN received SRES/RES:  (0 bytes)
 DVLR SUBSCR(IMSI-901700000004620) AUTH SRES/RES missing
-DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause Illegal MS
+DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause ILLEGAL_MS
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: state_chg to VLR_SUB_AS_AUTH_FAILED
 GSUP --> HLR: OSMO_GSUP_MSGT_AUTH_FAIL_REPORT: 0b010809710000004026f00a0101
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
diff --git a/tests/msc_vlr/msc_vlr_test_hlr_reject.err b/tests/msc_vlr/msc_vlr_test_hlr_reject.err
index 26d5736..305e1b8 100644
--- a/tests/msc_vlr/msc_vlr_test_hlr_reject.err
+++ b/tests/msc_vlr/msc_vlr_test_hlr_reject.err
@@ -43,7 +43,7 @@
 DREF VLR subscr IMSI-901700000004620 + vlr_gsup_rx: now used by 2 (active-conn,vlr_gsup_rx)
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Received Event VLR_AUTH_E_HLR_SAI_NACK
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: GSUP: rx Auth Info Error cause: 2: IMSI unknown in HLR
-DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Authentication terminating with result NO_AUTH_INFO, cause IMSI unknown in HLR
+DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Authentication terminating with result NO_AUTH_INFO, cause IMSI_UNKNOWN_IN_HLR
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: state_chg to VLR_SUB_AS_AUTH_FAILED
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Removing from parent vlr_lu_fsm(IMSI-901700000004620:GERAN-A:LU)
@@ -142,7 +142,7 @@
 DREF VLR subscr IMSI-901700000004620 + vlr_gsup_rx: now used by 2 (active-conn,vlr_gsup_rx)
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Received Event VLR_AUTH_E_HLR_SAI_NACK
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: GSUP: rx Auth Info Error cause: 17: Network failure
-DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Authentication terminating with result NO_AUTH_INFO, cause Network failure
+DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Authentication terminating with result NO_AUTH_INFO, cause NETWORK_FAILURE
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: state_chg to VLR_SUB_AS_AUTH_FAILED
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Removing from parent vlr_lu_fsm(IMSI-901700000004620:GERAN-A:LU)
@@ -738,7 +738,7 @@
 DREF VLR subscr IMSI-901700000004620:MSISDN-46071 + vlr_gsup_rx: now used by 3 (attached,active-conn,vlr_gsup_rx)
 DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Received Event VLR_AUTH_E_HLR_SAI_NACK
 DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: GSUP: rx Auth Info Error cause: 17: Network failure
-DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Authentication terminating with result NO_AUTH_INFO, cause Network failure
+DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Authentication terminating with result NO_AUTH_INFO, cause NETWORK_FAILURE
 DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: state_chg to VLR_SUB_AS_AUTH_FAILED
 DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Removing from parent vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU)
@@ -1006,7 +1006,7 @@
 DREF VLR subscr IMSI-901700000004620:MSISDN-46071 + vlr_gsup_rx: now used by 3 (attached,active-conn,vlr_gsup_rx)
 DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Received Event VLR_AUTH_E_HLR_SAI_NACK
 DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: GSUP: rx Auth Info Error cause: 2: IMSI unknown in HLR
-DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Authentication terminating with result NO_AUTH_INFO, cause IMSI unknown in HLR
+DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Authentication terminating with result NO_AUTH_INFO, cause IMSI_UNKNOWN_IN_HLR
 DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: state_chg to VLR_SUB_AS_AUTH_FAILED
 DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR VLR_Authenticate(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Removing from parent vlr_lu_fsm(IMSI-901700000004620:MSISDN-46071:GERAN-A:LU)
@@ -1104,7 +1104,7 @@
 <-- GSUP rx OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: 0a010809710000004026f00a0101
 DREF VLR subscr IMSI-901700000004620 + vlr_gsup_rx: now used by 2 (active-conn,vlr_gsup_rx)
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Received Event VLR_AUTH_E_HLR_SAI_ACK
-DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Authentication terminating with result FAILURE, cause Network failure
+DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: Authentication terminating with result FAILURE, cause NETWORK_FAILURE
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_NEEDS_AUTH_WAIT_AI}: state_chg to VLR_SUB_AS_AUTH_FAILED
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
 DVLR VLR_Authenticate(IMSI-901700000004620:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Removing from parent vlr_lu_fsm(IMSI-901700000004620:GERAN-A:LU)
diff --git a/tests/msc_vlr/msc_vlr_test_umts_authen.err b/tests/msc_vlr/msc_vlr_test_umts_authen.err
index dad0877..aacff39 100644
--- a/tests/msc_vlr/msc_vlr_test_umts_authen.err
+++ b/tests/msc_vlr/msc_vlr_test_umts_authen.err
@@ -2647,7 +2647,7 @@
 DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
 DVLR SUBSCR(IMSI-901700000010650) AUTH on GERAN received SRES/RES: e229c19e791f2e (7 bytes)
 DVLR SUBSCR(IMSI-901700000010650) AUTH SRES/RES has invalid length: 7. Expected either 4 (GSM AKA) or 8 (UMTS AKA)
-DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause Illegal MS
+DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause ILLEGAL_MS
 DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: state_chg to VLR_SUB_AS_AUTH_FAILED
 GSUP --> HLR: OSMO_GSUP_MSGT_AUTH_FAIL_REPORT: 0b010809710000000156f00a0101
 DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
@@ -2763,7 +2763,7 @@
 DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
 DVLR SUBSCR(IMSI-901700000010650) AUTH on UTRAN received RES: e229c19e791f2e (7 bytes)
 DVLR SUBSCR(IMSI-901700000010650) AUTH RES has invalid length: 7. Expected 8 (UMTS AKA)
-DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause Illegal MS
+DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause ILLEGAL_MS
 DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_WAIT_RESP}: state_chg to VLR_SUB_AS_AUTH_FAILED
 GSUP --> HLR: OSMO_GSUP_MSGT_AUTH_FAIL_REPORT: 0b010809710000000156f00a0101
 DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_AUTH_FAILED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
@@ -2879,7 +2879,7 @@
 DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
 DVLR SUBSCR(IMSI-901700000010650) AUTH on GERAN received SRES/RES: e229c19e791f2e4123 (9 bytes)
 DVLR SUBSCR(IMSI-901700000010650) AUTH SRES/RES has invalid length: 9. Expected either 4 (GSM AKA) or 8 (UMTS AKA)
-DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause Illegal MS
+DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause ILLEGAL_MS
 DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: state_chg to VLR_SUB_AS_AUTH_FAILED
 GSUP --> HLR: OSMO_GSUP_MSGT_AUTH_FAIL_REPORT: 0b010809710000000156f00a0101
 DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
@@ -2995,7 +2995,7 @@
 DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
 DVLR SUBSCR(IMSI-901700000010650) AUTH on UTRAN received RES: e229c19e791f2e4123 (9 bytes)
 DVLR SUBSCR(IMSI-901700000010650) AUTH RES has invalid length: 9. Expected 8 (UMTS AKA)
-DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause Illegal MS
+DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause ILLEGAL_MS
 DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_WAIT_RESP}: state_chg to VLR_SUB_AS_AUTH_FAILED
 GSUP --> HLR: OSMO_GSUP_MSGT_AUTH_FAIL_REPORT: 0b010809710000000156f00a0101
 DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_AUTH_FAILED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
@@ -3111,7 +3111,7 @@
 DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
 DVLR SUBSCR(IMSI-901700000010650) AUTH on GERAN received SRES/RES: e229c19e (4 bytes)
 DVLR SUBSCR(IMSI-901700000010650) GSM AUTH failure: mismatching sres (expected sres=9b 36 ef df )
-DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause Illegal MS
+DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause ILLEGAL_MS
 DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_WAIT_RESP}: state_chg to VLR_SUB_AS_AUTH_FAILED
 GSUP --> HLR: OSMO_GSUP_MSGT_AUTH_FAIL_REPORT: 0b010809710000000156f00a0101
 DVLR VLR_Authenticate(IMSI-901700000010650:GERAN-A:LU){VLR_SUB_AS_AUTH_FAILED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)
@@ -3227,7 +3227,7 @@
 DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
 DVLR SUBSCR(IMSI-901700000010650) AUTH on UTRAN received RES: e229c19e (4 bytes)
 DVLR SUBSCR(IMSI-901700000010650) AUTH via UTRAN, cannot allow GSM AKA (MS is R99 capable, vec has UMTS AKA tokens, res_len=4 is INVALID on UTRAN)
-DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause Illegal MS
+DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_WAIT_RESP}: Authentication terminating with result FAILURE, cause ILLEGAL_MS
 DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_WAIT_RESP}: state_chg to VLR_SUB_AS_AUTH_FAILED
 GSUP --> HLR: OSMO_GSUP_MSGT_AUTH_FAIL_REPORT: 0b010809710000000156f00a0101
 DVLR VLR_Authenticate(IMSI-901700000010650:UTRAN-Iu:LU){VLR_SUB_AS_AUTH_FAILED}: Terminating (cause = OSMO_FSM_TERM_REGULAR)