diff --git a/library/RSL_Types.ttcn b/library/RSL_Types.ttcn
index fa1d928..1940b09 100644
--- a/library/RSL_Types.ttcn
+++ b/library/RSL_Types.ttcn
@@ -2017,6 +2017,17 @@
 			t_RSL_IE(RSL_IE_L3_INFO, RSL_IE_Body:{l3_info := ts_RSL_L16V(l3_info)})
 		}
 	}
+	template RSL_Message tr_RSL_SACCH_INF_MOD(template RslChannelNr chan_nr,
+						  template RSL_IE_SysinfoType si_type := ?,
+						  template octetstring l3_info := ?) := {
+		msg_disc := tr_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
+		msg_type := RSL_MT_SACCH_INFO_MODIFY,
+		ies := {
+			tr_RSL_IE(RSL_IE_Body:{chan_nr := chan_nr}),
+			tr_RSL_IE(RSL_IE_Body:{sysinfo_type := si_type}),
+			tr_RSL_IE(RSL_IE_Body:{l3_info := tr_RSL_L16V(l3_info)})
+		}
+	}
 
 	/* 8.4.7 BTS -> BSC */
 	template (value) RSL_Message ts_RSL_HANDO_DET(template (value) RslChannelNr chan_nr) := {