diff --git a/sysinfo/GSM_Types.ttcn b/sysinfo/GSM_Types.ttcn
index 55548c6..3313d7c 100644
--- a/sysinfo/GSM_Types.ttcn
+++ b/sysinfo/GSM_Types.ttcn
@@ -411,6 +411,11 @@
 			      other, OTHERWISE;
 			)" };
 
+	external function enc_GsmRrMessage(in GsmRrMessage msg) return octetstring
+		with { extension "prototype(convert) encode(RAW)" };
+	external function dec_GsmRrMessage(in octetstring stream) return GsmRrMessage
+		with { extension "prototype(convert) decode(RAW)" };
+
 	/* Normal L3 Message on Dedicated Channel */
 
 	/* 9.1.25 Paging Response */