diff --git a/library/GSM_RestOctets.ttcn b/library/GSM_RestOctets.ttcn
index 2be96a4..5f99a85 100644
--- a/library/GSM_RestOctets.ttcn
+++ b/library/GSM_RestOctets.ttcn
@@ -281,6 +281,18 @@
 	variant (ext_ra) "BYTEORDER(last)"
 };
 
+
+external function enc_IaRestOctets(in IaRestOctets ro) return octetstring
+	with { extension "prototype(convert) encode(RAW)" };
+external function dec_IaRestOctets(in octetstring stream) return IaRestOctets
+	with { extension "prototype(convert) decode(RAW)" };
+
+external function enc_IARRestOctets(in IARRestOctets ro) return octetstring
+	with { extension "prototype(convert) encode(RAW)" };
+external function dec_IARRestOctets(in octetstring stream) return IARRestOctets
+	with { extension "prototype(convert) decode(RAW)" };
+
+
 /* 10.5.2.33b SI 2quater Rest Octets */
 type record SI2quaterRestOctets {
 	BIT1				ba_ind,