diff --git a/tester/call_tester.c b/tester/call_tester.c
index 17c5b6864..c20a94b4f 100644
--- a/tester/call_tester.c
+++ b/tester/call_tester.c
@@ -4074,7 +4074,7 @@ static void video_call_ice_params() {
 }
 #endif
 
-static void simple_stereo_call(const char *codec_name, int clock_rate, int bitrate_override) {
+static void simple_stereo_call(const char *codec_name, int clock_rate, int bitrate_override, bool_t stereo) {
 	int begin;
 	int leaked_objects;
 	LinphoneCoreManager* marie;
@@ -4096,10 +4096,10 @@ static void simple_stereo_call(const char *codec_name, int clock_rate, int bitra
 		ms_warning("%s not available, stereo with %s not tested.",codec_name, codec_name);
 		goto end;
 	}
-	payload_type_set_recv_fmtp(pt, "stereo=1;sprop-stereo=1");
+	if (stereo) payload_type_set_recv_fmtp(pt, "stereo=1;sprop-stereo=1");
 	if (bitrate_override) linphone_core_set_payload_type_bitrate(marie->lc, pt, bitrate_override);
 	pt = linphone_core_find_payload_type(pauline->lc, codec_name, clock_rate, 2);
-	payload_type_set_recv_fmtp(pt, "stereo=1;sprop-stereo=1");
+	if (stereo) payload_type_set_recv_fmtp(pt, "stereo=1;sprop-stereo=1");
 	if (bitrate_override) linphone_core_set_payload_type_bitrate(pauline->lc, pt, bitrate_override);
 
 	disable_all_audio_codecs_except_one(marie->lc, codec_name, clock_rate);
@@ -4110,8 +4110,6 @@ static void simple_stereo_call(const char *codec_name, int clock_rate, int bitra
 	linphone_core_set_use_files(pauline->lc, TRUE);
 	linphone_core_set_record_file(pauline->lc, recordpath);
 
-	remove(recordpath);
-
 	/*stereo is supported only without volume control, echo canceller...*/
 	lp_config_set_string(marie->lc->config,"sound","features","NONE");
 	lp_config_set_string(pauline->lc->config,"sound","features","NONE");
@@ -4123,11 +4121,19 @@ static void simple_stereo_call(const char *codec_name, int clock_rate, int bitra
 	if (clock_rate!=48000) ms_warning("Similarity checking not implemented for files not having the same sampling rate");
 	else{
 #if !defined(__arm__) && !defined(__arm64__) && !TARGET_IPHONE_SIMULATOR && !defined(ANDROID)
-		double similar;
-		const double threshold = .7f;
-		BC_ASSERT_EQUAL(ms_audio_diff(stereo_file,recordpath,&similar,audio_cmp_max_shift,NULL,NULL), 0, int, "%d");
-		BC_ASSERT_GREATER(similar, threshold, float, "%f");
-		BC_ASSERT_LOWER(similar, 1.f, float, "%f");
+		if (stereo){
+			double similar;
+			const double threshold = .7f;
+			BC_ASSERT_EQUAL(ms_audio_diff(stereo_file,recordpath,&similar,audio_cmp_max_shift,NULL,NULL), 0, int, "%d");
+			BC_ASSERT_GREATER(similar, threshold, float, "%f");
+			BC_ASSERT_LOWER(similar, 1.f, float, "%f");
+		}else{
+			double similar;
+			const double threshold = .7f;
+			BC_ASSERT_EQUAL(ms_audio_diff(stereo_file,recordpath,&similar,audio_cmp_max_shift,NULL,NULL), 0, int, "%d");
+			BC_ASSERT_LOWER(similar, threshold, float, "%f");
+			BC_ASSERT_LOWER(similar, 1.f, float, "%f");
+		}
 #endif
 	}
 
@@ -4146,11 +4152,16 @@ end:
 }
 
 static void simple_stereo_call_l16(void){
-	simple_stereo_call("L16", 44100, 0);
+	simple_stereo_call("L16", 44100, 0, TRUE);
 }
 
 static void simple_stereo_call_opus(void){
-	simple_stereo_call("opus", 48000, 150);
+	simple_stereo_call("opus", 48000, 150, TRUE);
+}
+
+static void simple_mono_call_opus(void){
+	/*actually a call where input/output is made with stereo but opus transmits everything as mono*/
+	simple_stereo_call("opus", 48000, 150, FALSE);
 }
 
 test_t call_tests[] = {
@@ -4274,7 +4285,8 @@ test_t call_tests[] = {
 	{ "Call with transport change after released", call_with_transport_change_after_released },
 	{ "Unsuccessful call with transport change after released",unsucessfull_call_with_transport_change_after_released},
 	{ "Simple stereo call with L16", simple_stereo_call_l16 },
-	{ "Simple stereo call with opus", simple_stereo_call_opus }
+	{ "Simple stereo call with opus", simple_stereo_call_opus },
+	{ "Simple mono call with opus", simple_mono_call_opus }
 };
 
 test_suite_t call_test_suite = {
diff --git a/tester/liblinphone_tester.c b/tester/liblinphone_tester.c
index d4f42190d..0a3a5ce4b 100644
--- a/tester/liblinphone_tester.c
+++ b/tester/liblinphone_tester.c
@@ -175,7 +175,8 @@ static const char* liblinphone_helper =
 		"\t\t\t--config <config path>\n"
 		"\t\t\t--domain <test sip domain>\n"
 		"\t\t\t--auth-domain <test auth domain>\n"
-		"\t\t\t--dns-hosts </etc/hosts -like file to used to override DNS names (default: tester_hosts)>\n";
+		"\t\t\t--dns-hosts </etc/hosts -like file to used to override DNS names (default: tester_hosts)>\n"
+		"\t\t\t--keep-recorded-files\n";
 
 #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
 int main (int argc, char *argv[])
@@ -220,6 +221,8 @@ int main (int argc, char *argv[])
 		}else if (strcmp(argv[i],"--dns-hosts")==0){
 			CHECK_ARG("--dns-hosts", ++i, argc);
 			userhostsfile=argv[i];
+		} else if (strcmp(argv[i],"--keep-recorded-files")==0){
+			liblinphone_tester_keep_recorded_files(TRUE);
 		} else {
 			int ret = bc_tester_parse_args(argc, argv, i);
 			if (ret>0) {
diff --git a/tester/liblinphone_tester.h b/tester/liblinphone_tester.h
index 6addcc655..4651a84d0 100644
--- a/tester/liblinphone_tester.h
+++ b/tester/liblinphone_tester.h
@@ -68,6 +68,12 @@ extern int liblinphone_tester_ipv6_available(void);
  */
 extern void liblinphone_tester_keep_accounts( int keep );
 
+/**
+ * @brief Tells the test whether to not remove recorded audio/video files after the tests.
+ * @details By default recorded files are erased after the test, unless the test is failed.
+**/
+void liblinphone_tester_keep_recorded_files(int keep);
+
 /**
  * @brief Clears the created accounts during the testing session.
  */
diff --git a/tester/tester.c b/tester/tester.c
index 9b380ecad..1a56f6479 100644
--- a/tester/tester.c
+++ b/tester/tester.c
@@ -31,6 +31,7 @@
 
 static bool_t liblinphone_tester_ipv6_enabled=FALSE;
 static int liblinphone_tester_keep_accounts_flag = 0;
+static int liblinphone_tester_keep_record_files = FALSE;
 static int manager_count = 0;
 
 const char* test_domain="sipopen.example.org";
@@ -40,7 +41,7 @@ const char* test_password="secret";
 const char* test_route="sip2.linphone.org";
 const char *userhostsfile = "tester_hosts";
 
- static void network_reachable(LinphoneCore *lc, bool_t reachable) {
+static void network_reachable(LinphoneCore *lc, bool_t reachable) {
 	stats* counters;
 	ms_message("Network reachable [%s]",reachable?"TRUE":"FALSE");
 	counters = get_stats(lc);
@@ -349,7 +350,7 @@ void linphone_core_manager_stop(LinphoneCoreManager *mgr){
 void linphone_core_manager_destroy(LinphoneCoreManager* mgr) {
 	if (mgr->lc){
 		const char *record_file=linphone_core_get_record_file(mgr->lc);
-		if (record_file){
+		if (!liblinphone_tester_keep_record_files && record_file){
 			if ((CU_get_number_of_failures()-mgr->number_of_cunit_error_at_creation)>0) {
 				ms_message ("Test has failed, keeping recorded file [%s]",record_file);
 			} else {
@@ -387,6 +388,10 @@ void liblinphone_tester_keep_accounts( int keep ){
 	liblinphone_tester_keep_accounts_flag = keep;
 }
 
+void liblinphone_tester_keep_recorded_files(int keep){
+	liblinphone_tester_keep_record_files = keep;
+}
+
 void liblinphone_tester_clear_accounts(void){
 	account_manager_destroy();
 }