diff --git a/library/RSL_Types.ttcn b/library/RSL_Types.ttcn
index 08e49b5..64025a5 100644
--- a/library/RSL_Types.ttcn
+++ b/library/RSL_Types.ttcn
@@ -2036,6 +2036,42 @@
 		}
 	}
 
+	/* 8.4.21 BTS -> BSC */
+	template (value) RSL_Message ts_RSL_TALKER_DET(template (value) RslChannelNr chan_nr) := {
+		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
+		msg_type := RSL_MT_TALKER_DET,
+		ies := {
+			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr})
+		}
+	}
+	template RSL_Message tr_RSL_TALKER_DET(template RslChannelNr chan_nr,
+					      template uint8_t acc_delay := ?) := {
+		msg_disc := tr_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
+		msg_type := RSL_MT_TALKER_DET,
+		ies := {
+			tr_RSL_IE(RSL_IE_Body:{chan_nr := chan_nr}),
+			tr_RSL_IE(RSL_IE_Body:{access_delay := acc_delay})
+		}
+	}
+
+	/* 8.4.22 BTS -> BSC */
+	template (value) RSL_Message ts_RSL_LISTENER_DET(template (value) RslChannelNr chan_nr) := {
+		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
+		msg_type := RSL_MT_LISTENER_DET,
+		ies := {
+			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr})
+		}
+	}
+	template RSL_Message tr_RSL_LISTENER_DET(template RslChannelNr chan_nr,
+					      template uint8_t acc_delay := ?) := {
+		msg_disc := tr_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
+		msg_type := RSL_MT_LISTENER_DET,
+		ies := {
+			tr_RSL_IE(RSL_IE_Body:{chan_nr := chan_nr}),
+			tr_RSL_IE(RSL_IE_Body:{access_delay := acc_delay})
+		}
+	}
+
 
 	/* COMMON CHANNEL MANAGEMENT MESSAGES */