diff --git a/library/AMR_Types.ttcn b/library/AMR_Types.ttcn
index b4f044d..5586a20 100644
--- a/library/AMR_Types.ttcn
+++ b/library/AMR_Types.ttcn
@@ -33,7 +33,13 @@
 const integer c_AMRFT_len[9] := {12, 13, 15, 17, 19, 20, 26, 31, 5};
 
 function f_amrft_payload_len(INT4b amr_ft) return integer {
-        return c_AMRFT_len[amr_ft];
+	return c_AMRFT_len[amr_ft];
+}
+
+const integer c_AMRFT_bits_len[9] := {95, 103, 118, 134, 148, 159, 204, 244, 39};
+
+function f_amrft_payload_bits_len(INT4b amr_ft) return integer {
+	return c_AMRFT_bits_len[amr_ft];
 }
 
 type record RTP_AMR_Hdr {