diff --git a/e2ap/lib/Interface-ID.c b/e2ap/lib/Interface-ID.c
new file mode 100644
index 0000000..1aa2b52
--- /dev/null
+++ b/e2ap/lib/Interface-ID.c
@@ -0,0 +1,67 @@
+/*
+ * Generated by asn1c-0.9.29 (http://lionet.info/asn1c)
+ * From ASN.1 module "E2SM-gNB-X2-IEs"
+ * 	found in "Spec/e2ap-v031ex.asn"
+ * 	`asn1c -fcompound-names -fno-include-deps -findirect-choice -gen-PER`
+ */
+
+#include "Interface-ID.h"
+
+#include "GlobalENB-ID.h"
+#include "GlobalGNB-ID.h"
+static asn_oer_constraints_t asn_OER_type_Interface_ID_constr_1 CC_NOTUSED = {
+	{ 0, 0 },
+	-1};
+asn_per_constraints_t asn_PER_type_Interface_ID_constr_1 CC_NOTUSED = {
+	{ APC_CONSTRAINED | APC_EXTENSIBLE,  1,  1,  0,  1 }	/* (0..1,...) */,
+	{ APC_UNCONSTRAINED,	-1, -1,  0,  0 },
+	0, 0	/* No PER value map */
+};
+asn_TYPE_member_t asn_MBR_Interface_ID_1[] = {
+	{ ATF_POINTER, 0, offsetof(struct Interface_ID, choice.global_eNB_ID),
+		(ASN_TAG_CLASS_CONTEXT | (0 << 2)),
+		-1,	/* IMPLICIT tag at current level */
+		&asn_DEF_GlobalENB_ID,
+		0,
+		{ 0, 0, 0 },
+		0, 0, /* No default value */
+		"global-eNB-ID"
+		},
+	{ ATF_POINTER, 0, offsetof(struct Interface_ID, choice.global_gNB_ID),
+		(ASN_TAG_CLASS_CONTEXT | (1 << 2)),
+		-1,	/* IMPLICIT tag at current level */
+		&asn_DEF_GlobalGNB_ID,
+		0,
+		{ 0, 0, 0 },
+		0, 0, /* No default value */
+		"global-gNB-ID"
+		},
+};
+static const asn_TYPE_tag2member_t asn_MAP_Interface_ID_tag2el_1[] = {
+    { (ASN_TAG_CLASS_CONTEXT | (0 << 2)), 0, 0, 0 }, /* global-eNB-ID */
+    { (ASN_TAG_CLASS_CONTEXT | (1 << 2)), 1, 0, 0 } /* global-gNB-ID */
+};
+asn_CHOICE_specifics_t asn_SPC_Interface_ID_specs_1 = {
+	sizeof(struct Interface_ID),
+	offsetof(struct Interface_ID, _asn_ctx),
+	offsetof(struct Interface_ID, present),
+	sizeof(((struct Interface_ID *)0)->present),
+	asn_MAP_Interface_ID_tag2el_1,
+	2,	/* Count of tags in the map */
+	0, 0,
+	2	/* Extensions start */
+};
+asn_TYPE_descriptor_t asn_DEF_Interface_ID = {
+	"Interface-ID",
+	"Interface-ID",
+	&asn_OP_CHOICE,
+	0,	/* No effective tags (pointer) */
+	0,	/* No effective tags (count) */
+	0,	/* No tags (pointer) */
+	0,	/* No tags (count) */
+	{ &asn_OER_type_Interface_ID_constr_1, &asn_PER_type_Interface_ID_constr_1, CHOICE_constraint },
+	asn_MBR_Interface_ID_1,
+	2,	/* Elements count */
+	&asn_SPC_Interface_ID_specs_1	/* Additional specs */
+};
+