diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 7c12559b4..2695ce20b 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -3933,6 +3933,16 @@ testcase TC_assignment_codec_amr_h_start_mode_auto() runs on test_CT {
 		start_mode := "auto");
 }
 
+testcase TC_assignment_codec_amr_f_start_mode_4() runs on test_CT {
+	f_TC_assignment_codec_amr(true, '2b9520882208'O, '11111111'B, '00000010'B,
+		start_mode := "4");
+}
+
+testcase TC_assignment_codec_amr_h_start_mode_4() runs on test_CT {
+	f_TC_assignment_codec_amr(false, '2b15208820'O, '10010101'B, '00010101'B,
+		start_mode := "4");
+}
+
 private function f_disable_all_tch_f() runs on test_CT {
 	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 1 sub-slot 0 borken");
 	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 2 sub-slot 0 borken");
@@ -8451,6 +8461,8 @@ control {
 		execute( TC_assignment_codec_amr_h_S7() );
 		execute( TC_assignment_codec_amr_f_start_mode_auto() );
 		execute( TC_assignment_codec_amr_h_start_mode_auto() );
+		execute( TC_assignment_codec_amr_f_start_mode_4() );
+		execute( TC_assignment_codec_amr_h_start_mode_4() );
 		execute( TC_assignment_codec_amr_startmode_cruft() );
 	}