diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 2989cb8..2a56a25 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -8292,6 +8292,14 @@
 	vc_conn := f_start_handler(refers(f_TC_speech_no_rtp), pars);
 	vc_conn.done;
 
+	/* TS1, TCH/F, V2 (EFR codec) */
+	pars := valueof(t_Pars(ts_RslChanNr_Bm(1), ts_RSL_ChanMode(RSL_CHRT_TCH_F, RSL_CMOD_SP_GSM2)));
+	vc_conn := f_start_handler(refers(f_TC_speech_no_rtp), pars);
+	vc_conn.done;
+
+	/* TODO: we don't know what's the expected behavior for TCH/AFS, so we don't test it here.
+	 * Current osmo-bts is sending FACCH/F with dummy LAPDm func=UI frames. */
+
 	Misc_Helpers.f_shutdown(__BFILE__, __LINE__);
 }
 testcase TC_speech_no_rtp_tchh() runs on test_CT {
@@ -8305,6 +8313,9 @@
 	vc_conn := f_start_handler(refers(f_TC_speech_no_rtp), pars);
 	vc_conn.done;
 
+	/* TODO: we don't know what's the expected behavior for TCH/AHS, so we don't test it here.
+	 * Current osmo-bts is sending FACCH/H with dummy LAPDm func=UI frames (whenever possible). */
+
 	Misc_Helpers.f_shutdown(__BFILE__, __LINE__);
 }