diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index ea67105..d392a71 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -1652,6 +1652,45 @@
 	return ret;
 }
 
+private function f_rsl_chmod_tmpl_from_codec(BSSMAP_FIELD_CodecElement a_elem)
+return template RSL_IE_Body {
+	var template RSL_IE_Body mode_ie := {
+		chan_mode := {
+			len := ?,
+			reserved := ?,
+			dtx_d := ?,
+			dtx_u := ?,
+			spd_ind := RSL_SPDI_SPEECH,
+			ch_rate_type := -,
+			coding_alg_rate := -
+		}
+	}
+
+	select (a_elem.codecType) {
+	case (GSM_FR) {
+		mode_ie.chan_mode.ch_rate_type := RSL_CHRT_TCH_F;
+		mode_ie.chan_mode.coding_alg_rate := RSL_CMOD_SP_GSM1;
+	}
+	case (GSM_HR) {
+		mode_ie.chan_mode.ch_rate_type := RSL_CHRT_TCH_H;
+		mode_ie.chan_mode.coding_alg_rate := RSL_CMOD_SP_GSM1;
+	}
+	case (GSM_EFR) {
+		mode_ie.chan_mode.ch_rate_type := RSL_CHRT_TCH_F;
+		mode_ie.chan_mode.coding_alg_rate := RSL_CMOD_SP_GSM2;
+	}
+	case (FR_AMR) {
+		mode_ie.chan_mode.ch_rate_type := RSL_CHRT_TCH_F;
+		mode_ie.chan_mode.coding_alg_rate := RSL_CMOD_SP_GSM3;
+	}
+	case (HR_AMR) {
+		mode_ie.chan_mode.ch_rate_type := RSL_CHRT_TCH_H;
+		mode_ie.chan_mode.coding_alg_rate := RSL_CMOD_SP_GSM3;
+	}
+	}
+	return mode_ie;
+}
+
 type record CodecListTest {
 	BSSMAP_IE_SpeechCodecList codec_list,
 	charstring id
@@ -1672,6 +1711,19 @@
 	log("expecting ASS COMPL like this: ", exp_compl);
 
 	f_establish_fully(ass_cmd, exp_compl);
+
+	/* Verify that the RSL-side activation actually matches our expectations */
+	var RSL_Message rsl := f_rslem_get_last_act(RSL_PROC, 0, g_chan_nr);
+
+	var RSL_IE_Body mode_ie;
+	if (f_rsl_find_ie(rsl, RSL_IE_CHAN_MODE, mode_ie) == false) {
+		setverdict(fail, "Couldn't find CHAN_MODE IE");
+		self.stop;
+	}
+	var template RSL_IE_Body t_mode_ie := f_rsl_chmod_tmpl_from_codec(g_pars.ass_codec_list.codecElements[0]);
+	if (not match(mode_ie, t_mode_ie)) {
+		setverdict(fail, "RSL Channel Mode IE doesn't match expectation");
+	}
 }
 
 testcase TC_assignment_codec_fr() runs on test_CT {