diff --git a/library/MNCC_Types.ttcn b/library/MNCC_Types.ttcn
index 7bd47ee..f1d9e37 100644
--- a/library/MNCC_Types.ttcn
+++ b/library/MNCC_Types.ttcn
@@ -16,6 +16,7 @@
 
 /* GSM 04.08 Bearer Capability: Signalling access protocol */
 type enumerated GSM48_bcap_sig_access {
+	GSM48_BCAP_SA_NONE		(0),
 	GSM48_BCAP_SA_I440_I450 	(1),
 	GSM48_BCAP_SA_X21		(2),
 	GSM48_BCAP_SA_X28_DP_IN		(3),
@@ -26,6 +27,7 @@
 
 /* GSM 04.08 Bearer Capability: User Rate */
 type enumerated GSM48_bcap_user_rate {
+	GSM48_BCAP_UR_NONE		(0),
 	GSM48_BCAP_UR_300		(1),
 	GSM48_BCAP_UR_1200		(2),
 	GSM48_BCAP_UR_2400		(3),
@@ -46,6 +48,7 @@
 
 /* GSM 04.08 Bearer Capability: Intermediate Rate */
 type enumerated GSM48_bcap_interm_rate {
+	GSM48_BCAP_IR_NONE		(0),
 	GSM48_BCAP_IR_8k		(2),
 	GSM48_BCAP_IR_16k		(3)
 };